diff --git "a/5tE4T4oBgHgl3EQf1g0M/content/tmp_files/load_file.txt" "b/5tE4T4oBgHgl3EQf1g0M/content/tmp_files/load_file.txt" new file mode 100644--- /dev/null +++ "b/5tE4T4oBgHgl3EQf1g0M/content/tmp_files/load_file.txt" @@ -0,0 +1,965 @@ +filepath=/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf,len=964 +page_content='EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH (CERN) CERN-EP-2022-280 2023/01/16 CMS-HIN-21-006 K0 S and Λ (Λ) two-particle femtoscopic correlations in PbPb collisions at √sNN = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV The CMS Collaboration Abstract Two-particle correlations are presented for K0 S, Λ, and Λ strange hadrons as a func- tion of relative momentum in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The dataset corresponds to an integrated luminosity of 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='607 nb−1 and was collected using the CMS detector at the CERN LHC.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' These correlations are sensitive to quantum statistics and to final-state interactions between the particles.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The source size extracted from the K0 SK0 S correlations is found to decrease from 4 to 1 fm in going from central to peripheral collisions.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Strong interaction scattering pa- rameters (i.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=', scattering length and effective range) are determined from the ΛK0 S and ΛΛ (including their charge conjugates) correlations using the Lednick´y–Lyuboshitz model and are compared to theoretical and other experimental results.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Submitted to Physics Letters B © 2023 CERN for the benefit of the CMS Collaboration.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' CC-BY-4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='0 license arXiv:2301.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='05290v1 [nucl-ex] 12 Jan 2023 1 1 Introduction Two-particle correlations in relative momentum, so-called femtoscopic correlations, arising from relativistic heavy ion collisions provide a powerful tool for studying both the quark-gluon plasma (QGP) that is created in the collisions, and the subsequent interactions of the emitted particles [1].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' All two-particle correlations are affected by final-state interaction (FSI) effects, and correlations of identical particles are also sensitive to the constraints of quantum statistics (QS).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The correlations among the neutral K0 S, Λ, and Λ particles, collectively referred to as V0 particles, are of special interest.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' First, they can be used to determine the space-time extent of the QGP.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' In addition, information can be extracted about the strong-interaction scattering pa- rameters, i.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=', the scattering length and the effective range, that is impossible to obtain from currently achievable scattering experiments [2–6].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Because of their relatively heavy mass and the absence of a Coulomb interaction, femtoscopy based on K0 S particles supplements the more commonly studied pion and charged kaon pairs [7].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The results from ΛΛ correlation studies can help constrain baryon-baryon and, more specifically, hyperon-hyperon interaction models that are used, for example, in modeling the composition of neutron stars [8–10].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Regarding the scattering parameters, of particular interest is establishing whether the interac- tion between two Λ particles allows for the existence of the H-dibaryon, a bound state with quantum numbers I = 0, JP = 0+, S = −2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' In 1977, R.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' L.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Jaffe predicted the existence of such a six-quark (uuddss) state having a mass about 81 MeV below the threshold of twice the Λ mass by considering the strong attraction resulting from color magnetic interactions [11].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Although a double hypernucleus, 6 ΛΛHe, was subsequently observed in the NAGARA event from the E313 hybrid emulsion experiment at KEK [12, 13], the observed ΛΛ binding energy was not consistent with the conjectured H-dibaryon [14].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' A study of ΛΛ correlations may provide ad- ditional information on whether the baryon-baryon interaction can lead to the formation of the conjectured H-dibaryon.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Recently, the ALICE Collaboration reported on ΛK correlations in lead-lead (PbPb) collisions at a center-of-mass energy per nucleon pair of √sNN = 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='76 TeV [15].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' According to their find- ings, the strong force is repulsive in ΛK+ interactions, yet attractive in ΛK− interactions.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' For the ΛK0 S pairs, the uncertainty of the ALICE results does not permit a definite conclusion on whether the associated strong interaction is repulsive or attractive.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' A more precise mea- surement of ΛK0 S correlations should improve our understanding of the strong interaction in baryon-meson systems.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' This Letter presents K0 SK0 S, ΛK0 S, and ΛΛ femtoscopic correlations as a function of relative momentum in PbPb collisions at √sNN = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV, using data recorded by the CMS experi- ment during the 2018 LHC run.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The K0 SK0 S correlations are measured in six centrality intervals within the 0–60% range, where centrality refers to the percentage of the total inelastic hadronic nucleus-nucleus cross section [16], and 0% corresponds to the maximum overlap of the col- liding nuclei.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The K0 SK0 S, ΛK0 S, and ΛΛ correlations are measured in an integrated centrality range (0–80%), with the ΛΛ femtoscopic correlation measured in PbPb collisions at the LHC for the first time.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The source size and strong interaction parameters are determined using the Lednick´y–Lyuboshitz (LL) model [17].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Unless otherwise indicated, all measurements include the charge conjugate states, so ΛK0 S and ΛΛ include ΛK0 S and ΛΛ, respectively.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Tabulated results are provided in the HEPData record for this analysis [18].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 2 2 Experimental setup and data sample The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diam- eter, providing a magnetic field of 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 T.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Within the solenoid volume there is a silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter, and a brass and scintil- lator hadron calorimeter, each composed of a barrel and two endcap sections.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The silicon pixel detector [19] is composed of 1856 silicon pixel modules distributed in four 54 cm long bar- rel layers at radii of 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='9–16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='0 cm plus three pairs of endcap disks covering radii of 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5–16.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 cm at longitudinal distances of 31–51 cm from the origin.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The 15 148 silicon strip module are ar- ranged in 10 barrel layers at radii of 20–116 cm plus 3 pairs of small and 9 pairs of large endcap disk layers.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Charged particles of pseudorapidity |η| < 3 are reconstructed with the combined system.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' For particles with transverse momentum of 1 < pT < 10 GeV, the track resolutions are typically 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5% in pT and 20–75 µm in the transverse impact parameter [20].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The barrel and endcap detectors are extended to the forward region with two calorimeters which use steel as the absorber and quartz fibers as the sensitive material.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' These hadron forward (HF) calorime- ters are located 11.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 m from the interaction region, one on each side, and provide coverage in the range 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='0 < |η| < 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' These detectors are segmented into multiple 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='175×0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='175 (∆η×∆φ) “towers”, where φ is azimuthal angle in radians.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Muons are measured in gas-ionization detec- tors embedded in the steel flux-return yoke outside the solenoid.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Events of interest are selected using a two-tiered trigger system.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The first level, composed of custom hardware processors, uses information from the calorimeters and muon detectors to select events at a rate of around 100 kHz within a fixed latency of about 4 µs [21].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The second level, known as the high-level trigger, consists of a farm of processors running a version of the full event reconstruction soft- ware optimized for fast processing, and reduces the event rate to around 1 kHz before data storage [22].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in Ref.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' [23].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' With an integrated luminosity of 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='607 nb−1 [24, 25], this analysis uses 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='27 × 109 minimum bias events that are triggered by requiring signals above the readout threshold of 3 GeV in each of the HF calorimeters [22].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Background events due to beam-gas interactions and non-hadronic collisions are filtered offline by applying the procedure described in Ref.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' [26].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The events used in this analysis are required to have at least one primary interaction vertex determined using two or more tracks [27] within a distance of 15 cm from the center of the nominal interaction point along the beam axis and to have at least two calorimeter towers in each HF detector with energy deposits of more than 4 GeV per tower.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The shapes of the clusters in the pixel detector are required to be compatible with those expected in PbPb collisions in order to suppress the contamination from events with multiple collisions [28].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The combined trigger and offline selection efficiency for inelastic events is greater than 95%.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The event centrality is obtained from the transverse energy deposited in both HF calorimeters, using the methodology described in Ref.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' [29].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The analysis makes use of a minimum bias Monte Carlo PbPb sample, based on the HYDJET 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='9 [30] event generator with a full detector simulation using GEANT4 [31].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 3 Reconstruction of K0 S and Λ candidates The K0 S and Λ candidates, denoted as V0 candidates, used in this study are reconstructed as in previous CMS analyses [32–34].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The V0 candidates are found by combining oppositely charged tracks that pass criteria based on the “loose” selection discussed in Ref.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' [27].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The charged tracks are assumed to be π+π− in K0 S reconstruction and π−p in Λ reconstruction.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' For the latter, the higher momentum track is assumed to be a proton since the proton carries nearly all of the mo- mentum in the Λ decay.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Each of the oppositely charged tracks must have hits in at least three 3 layers of the silicon tracker, and both tracks must have transverse and longitudinal impact pa- rameter significances (defined as the parameter value divided by its uncertainty) with respect to the primary vertex greater than 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The two tracks are fitted to a common vertex and the χ2 per degree of freedom (dof) from the fit must be less than 7.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The distance of closest approach between the two tracks is required to be less than 1 cm.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' As a consequence of the long lifetime of K0 S and Λ particles, the significance of the V0 decay length, which is the three-dimensional dis- tance between the primary and V0 vertices divided by its uncertainty, is required to be greater than 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 to reduce combinatorial background contributions.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' To remove K0 S candidates misiden- tified as Λ particles and vice versa, the Λ (K0 S) candidates must have a corresponding ππ (pπ) mass more than 14 (7) MeV (corresponding to approximately 3 times the average resolution) away from the world-average value [35] of the K0 S (Λ) mass.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The angle θ between the V0 mo- mentum vector and the vector connecting the primary and V0 vertices is required to satisfy cos θ > 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='999.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' This reduces the contribution from nuclear interactions, random combinations of tracks, and Λ particles originating from weak decays of Ξ and Ω particles.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Further selection of V0 candidates is performed with a boosted decision tree (BDT) [36].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The se- lection is optimized separately for K0 S and Λ candidates.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The discriminating variables include: the collision centrality, the V0 candidate pT and rapidity (y), the distance of closest approach of the track pair, the three-dimensional decay length and significance, cos θ, and the V0 ver- tex fit χ2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The included variables related to the V0 daughters are pT, uncertainty in pT, η, the number of hits in the silicon tracker, the number of pixel detector layers with hits, and the transverse and longitudinal impact parameter significances with respect to the primary ver- tex.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The BDT training is performed using the simulated minimum bias sample separated into the signal and background subsamples using the generator-level information.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The K0 S mesons are selected with 1 < pT < 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV and |y| < 1, while the Λ baryons are required to have 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 < pT < 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV and |y| < 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The minimum pT and maximum y requirements are used to reduce background while the maximum pT requirement is to reduce contributions from jets.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The combined V0 reconstruction and selection efficiencies are strongly dependent on the cen- trality of the event and the pT of the V0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Integrating over the selected pT ranges, the combined efficiencies from the most central to peripheral PbPb collisions are 1–3% for K0 S and 1–2% for Λ.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The V0 reconstruction algorithm does not prevent a track from being used for more than one V0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' While this is normally an infrequent occurrence, selecting pairs of V0 particles close together in phase space makes it a significant contribution.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' To resolve this problem, for each correlation measurement, a check of each pair of V0 candidates is performed and if two V0 can- didates are found to share one or both daughter tracks, one of the V0 candidates is randomly selected to be removed from the event.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Fits to the invariant mass spectrum are performed using a sum of three Gaussian functions with a common mean to describe the signal distribution and a fourth-order polynomial to de- scribe the background.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' These empirical functions were chosen to provide a good description of the data.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Peak and sideband invariant mass regions are defined to select events dominated by signal and background, respectively.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Defining σ as the average resolution based on the Gaus- sian sum, the peak regions are selected to be within ±2σ from the nominal V0 mass and are given by 486 < M(π+π−) < 509 MeV and 1111.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 < M(pπ−) < 1120.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 MeV for K0 S and Λ candidates, respectively.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The sideband regions are selected to be more than 4σ from the nom- inal V0 mass and are given by 23.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 < |M(π+π−) − 497.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5| < 62.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 MeV for K0 S candidates and 1080 < M(pπ−) < 1107.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 MeV together with 1124.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 < M(pπ−) < 1160 MeV for Λ candidates.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Examples of invariant mass distributions for π+π− and pπ− pairs, and their corresponding fits in the 0–80% centrality range, are shown in Fig.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 4 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='45 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='55 invariant mass (GeV) − π + π 6 10 7 10 8 10 Candidates / (0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 MeV) Data Fit Background Peak region Sideband region ) 1 = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV (0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='607 nb NN s PbPb, CMS S 0 K Centrality: 0-80% < 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV T 1 < p |y| < 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='08 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='12 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='14 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='16 invariant mass (GeV) + π p + − π p 5 10 6 10 Candidates / (0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 MeV) Data Fit Background Peak region Sideband region ) 1 = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV (0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='607 nb NN s PbPb, CMS Λ + Λ Centrality: 0-80% < 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV T 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 < p |y| < 1 Figure 1: The invariant mass of K0 S (left) and Λ (right), and their corresponding fits in the 0–80% centrality range.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The circles are the data, and the fit is shown with a solid (red) line for the total fit, and a dashed (green) line for the background fit.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The vertical dashed-dotted (pink) lines indicate the peak region and the vertical dashed (blue) lines indicate the sideband regions.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 4 Analysis method The two-particle correlation is constructed as Cobs(qinv) = N Aobs(qinv) Bobs(qinv) , (1) where Cobs(qinv) is the observed normalized pair yield, corrected for detector effects, as a func- tion of the invariant relative momentum qinv, defined as [1] qinv = � −QµQµ, Qµ = (k1 − k2)µ − (k1 − k2)µPµ PµPµ Pµ, (2) where P = k1 + k2, and k1 and k2 are the four momenta of the V0 particles.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Note that for two particles of the same mass, the second term of Qµ is zero.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The distribution Aobs(qinv) is the signal distribution that contains femtoscopic correlations formed by pairing the selected V0 particles from a given event.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The reference distribution Bobs(qinv) is used to correct for phase space effects, largely removing artifacts due to detector non-uniformities in the Aobs(qinv) distribution.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The Bobs(qinv) distribution is constructed by mixing the V0 particles from different events [37].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' In this procedure, the V0 particle from one event is paired with V0 particles from 30 different events.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' To ensure that the 30 events used in the mixing are similar to the signal events, the centrality and primary vertex of each mixed event must be within 5% and 2 cm, respectively, of those in the corresponding signal event.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The normalization factor N is the ratio of the number of pairs in the reference distribution to that in the signal distribution.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Because of the background in the peak region of the invari- ant mass distributions, the measured signal distribution (Aobs(qinv)) contains contributions from signal-signal (Ass(qinv)), signal-background (Asb(qinv)), and background-background (Abb(qinv)) correlations.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The measured Aobs(qinv) distribution can be written as Aobs(qinv) = f ssAss(qinv) + f sbAsb(qinv) + f bbAbb(qinv).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (3) 5 The distributions Asb(qinv) and Abb(qinv) are obtained from the peak-sideband and sideband- sideband combinations, respectively.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The small amount of background (signal) contamination in the signal (sideband) region has a negligible effect on the shape of Asb(qinv) (Abb(qinv)).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' All distributions, Aobs(qinv), Asb(qinv), and Abb(qinv) are normalized to unity.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The parameters, f ss, f sb, and f bb are the signal-signal, signal-background, and background-background fractions, extracted using an invariant mass fit based on combinatorial analyses with f ss = (s 2) (s+b 2 ) , f bb = (b 2) (s+b 2 ) , and f sb = 1 − f ss − f bb, (4) where (n 2) = n(n−1) 2 is the binomial coefficient, which returns the number of ways that a pair can be chosen from n objects.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The quantities s and b in the binomial coefficients are the number of signal and background particles, respectively, obtained by integrating the appropriate function from the fit to the invariant mass distribution.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Once we have all the distributions (Aobs(qinv), Asb(qinv), and Abb(qinv)) and the parameters ( f ss, f sb, and f bb), the Ass(qinv) distribution can be extracted using Eq.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (3), with Ass(qinv) = � Aobs(qinv) − f sb(Asb(qinv)) − f bb(Abb(qinv)) � / f ss.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (5) The same procedure is followed for the reference distribution.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' After extracting the Ass(qinv) and Bss(qinv) distributions, the correlation distribution is calculated as Css(qinv) = N Ass(qinv) Bss(qinv) .' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (6) While the Css(qinv) distribution is corrected for detector effects and non-V0 backgrounds, it still includes non-femtoscopic background correlations, such as those associated with elliptic flow [38], minijets [7], resonance decays [7], and energy-momentum conservation [39].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The non-femtoscopic background contribution is modeled using an empirically determined double Gaussian function Ω(qinv) = N � 1 + α1e−q2 invR2 1 � � 1 − α2e−q2 invR2 2 � , (7) where N, α1, α2, R1, and R2 are fit parameters.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' This function was selected for its reproduction of the distributions in both real data at high qinv and simulated data that do not include the correlations being measured.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Fits are performed to the Css(qinv) distributions to extract the source size and strong interaction scattering parameters.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' As the V0 particles are neutral, the Coulomb interaction is absent.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' How- ever, the correlations are sensitive to QS and FSI effects, with s-wave interactions assumed to dominate for the small relative momenta of the particle pairs analyzed.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The correlation distri- bution for all pairs (K0 SK0 S, ΛK0 S, and ΛΛ) is interpreted in the LL model.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' This model relates the two-particle correlation function to the source size and also takes into account FSI effects [17].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The general correlation function is Ctotal(qinv) = � 1 + λ � CQS(qinv) + CFSI(qinv) �� Ω(qinv), (8) 6 where CQS(qinv) is the QS function and CFSI(qinv) is the FSI function.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The parameter λ is re- ferred to as the incoherence parameter.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' In the absence of FSI effects, λ equals unity for a perfectly incoherent Gaussian source.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Effects such as resonance decay violate the incoherent source assumption and can lead to deviations of the λ parameter from the unity.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Its value can also be affected by non-Gaussian components of the correlations function and by the FSI between particles.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Neglecting CP violation, the K0 SK0 S system can be written as |K0 SK0 S⟩ = 1 2 � |K0K0⟩ + |K0K0⟩ + |K0K0⟩ + |K0K0⟩ � .' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (9) It can be shown [17, 40] that the resulting correlations follow Bose–Einstein quantum statistics, with CQS(qinv) = e(−q2 invR2 inv), (10) where the source radius Rinv reflects the size of the region over which the particles are emitted.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The FSI for the K0 SK0 S correlations is modeled by [17, 40] CFSI(qinv) = 1 2 ����� f (k) Rinv ���� 2 + 4ℜ f (k) √πRinv F1(qinvRinv) − 2ℑ f (k) Rinv F2(qinvRinv) � , (11) where k = qinv/2, F1(z) = 1 2e−z2 � z 0 ex2dx, and F2(z) = 1 − e−z2 z .' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (12) The function f (k) is the K0K0 s-wave scattering amplitude, with real and imaginary parts ℜ f (k) and ℑ f (k), respectively.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' This amplitude is dominated by the near-threshold s-wave isoscalar resonance f0(980) and the s-wave isovector resonance a0(980), with the total scattering ampli- tude given by an average of these contributions: f (k) = ( ff0(980)(k) + fa0(980)(k))/2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The indi- vidual resonance amplitudes depend on the resonance mass mr, with r = f0(980) or a0(980), the kaon mass mK, and the resonance couplings γr (γ′ r) to the K0K0 (ππ for f0(980) and π0η for a0(980) channels.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Then, fr(k) = γr/ � m2 r − ζ − iγrk − iγ′ rk′ r � , where ζ = 4(m2 K + k2) and k′ r denotes the momentum in the second (ππ or π0η) decay channel with the corresponding partial width Γ′ = γ′ rk′ r/mr (more details can be found in Ref.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' [40]).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The scattering amplitude is calculated using the resonance mass and the coupling parameters from Refs.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' [41–44], taken from row C of Table 1 of Ref.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' [40].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' For the correlations involving Λ baryons, the CQS(qinv) and CFSI(qinv) functions are [17] CQS(qinv) = αe(−q2 invR2 inv), and CFSI(qinv) = (1 + α) � 1 2 | f (k)|2 R2 inv � 1 − 1 2√π d0 Rinv � + 2ℜ f (k) √πRinv F1(qinvRinv) − ℑ f (k) Rinv F2(qinvRinv) � , (13) where α = −1/2 for ΛΛ correlations for two identical fermions and α = 0 for ΛK0 S corre- lations as there are no QS effects for non-identical particles [17].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The scattering amplitude 7 f (k) is parameterized by a complex scattering length (f0) and an effective range (d0) with f (k) = [1/ f0 + d0k2/2 − ik]−1 [17].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The imaginary part of f0 is responsible for inelastic pro- cesses (annihilation).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' For an attractive interaction that is not strong enough to produce a bound state, the real part of f0 is positive, while a repulsive interaction corresponds to a negative ℜ f0 of the order of the range of the repulsive potential.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' In the presence of a bound state, ℜ f0 is also negative, but with a much larger magnitude.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The femtoscopic sign convention and notation for the scattering length differ from those used in nuclear physics, where the corresponding scattering length a0 = − f0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' As the ΛK0 S and ΛΛ correlations each have only one spin state that contributes to the s-wave scattering, Eq.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (13) suffices to describe the FSI effects.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Fits to the correlation distribution of all the pairs were performed using Eq.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (8) with the non- femtoscopic background parameters (N, α1, α2, R1, and R2) treated as free parameters.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' For K0 SK0 S correlations, the parameters of interest are Rinv and λ, with the scattering amplitude based on previous measurements [41–44].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The ΛK0 S and ΛΛ correlations include additional parameters: d0, ℜ f0, and ℑ f0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The ℑ f0 term for ΛΛ correlations is set to zero since there are no baryon-baryon annihilation processes.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Histograms of the correlation distributions are generated in the range 0 < qinv < 6 GeV with 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 GeV wide bins for the K0 SK0 S and ΛK0 S correlations and 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='04 GeV wide bins for the ΛΛ cor- relations.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The fits exclude the first qinv bin to avoid a potential bias from the method used to address cases where V0 candidates share daughter tracks.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Studies using simulated events in- dicate that only this first bin is affected by this remediation.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Least-square fits are performed to the experimental data with the uncertainties in the fit parameters calculated using the MINOS technique [45].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Examples of correlation measurements and their fits and corresponding χ2/dof values, are presented in Figs.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 2 and 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The K0 SK0 S correlations, shown in Fig.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 2, are independently fitted for each of the six centrality bins with 0 < kT < 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV, where kT ≡ |⃗pT,1 + ⃗pT,2|/2 is the average transverse momentum of the particle pair.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' While the LL model assumes a Gaus- sian source function, results from charged-particle correlations have demonstrated that this assumption breaks down for peripheral collisions [46].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' This is likely the cause of the poor fit at low qinv for centralities above 40%.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The ΛK0 S (left) and ΛΛ (right) correlations, shown in Fig.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 3, involve fewer events and, therefore, only a single fit is performed for each, with the data integrated over the centrality range 0–80% and with no restriction on kT.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 5 Systematic uncertainties The systematic uncertainties for the fit parameters are based on the changes found in the pa- rameter values after individually varying each of the analysis criteria, as discussed below.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' In cases with more than one variation for a single source, the maximum deviation from the nom- inal value is used.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The total systematic uncertainty is obtained by adding the uncertainties from each source in quadrature.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The BDT discriminant is varied so as to adjust the signal-to- background ratio, with the signal yield changing by ±15% in the process.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The nominal method to account for V0 candidates sharing daughter tracks is to remove one of the V0 candidates at random, which is then not used by any pair.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Two alternative approaches are used, one in which both V0 candidates are removed and another in which, for events with multiple V0 candidate pair combinations, only the pairs in which the two particles share a daughter are removed.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The systematic uncertainties related to V0 signal and background modeling are investigated by varying the background shape from a fourth- to a third-order polynomial and the signal shape from a sum of three Gaussian functions to a sum of two or four Gaussian functions.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' An alterna- tive non-femtoscopic background function Ω(qinv) = N(1 + Be−|qinv/σ|2)(1 + ϵqinv) is used to assess the uncertainty associated with the choice of the non-femtoscopic background function.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 8 ) 1 = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV (0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='607 nb NN s PbPb, CMS 0-10% : 287 2 χ 0 S K 0 S K dof: 292 30-40% : 306 2 χ 0 S K 0 S K dof: 292 10-20% : 323 2 χ 0 S K 0 S K dof: 292 40-50% : 334 2 χ 0 S K 0 S K dof:292 20-30% : 312 2 χ 0 S K 0 S K dof: 292 50-60% : 353 2 χ 0 S K 0 S K dof: 292 < 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV T 1 < p < 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV T 0 < k Data Full fit Nonfemto 0 2 4 6 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 2 ) inv (q ss C 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 2 ) inv (q ss C : 19 2 χ # bins: 19 0 2 4 6 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 2 ) inv (q ss C 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 (GeV) inv q 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 ) inv (q ss C : 25 2 χ # bins: 19 0 2 4 6 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 2 ) inv (q ss C 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 ) inv (q ss C : 43 2 χ # bins: 19 0 2 4 6 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 2 ) inv (q ss C 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 ) inv (q ss C : 18 2 χ # bins: 19 0 2 4 6 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 2 ) inv (q ss C 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 2 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 ) inv (q ss C : 40 2 χ # bins: 19 0 2 4 6 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 2 ) inv (q ss C 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 (GeV) inv q 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 ) inv (q ss C : 13 2 χ # bins: 19 Figure 2: The correlation distributions and fits for K0 SK0 S pairs in different centrality ranges, starting from 0–10% centrality to 50–60% centrality, with 0 < kT < 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' In each plot, the red circles are the data, the blue solid line is the fit using Eq.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (8), and the green dotted line is the non-femtoscopic background from Eq.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (7).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The χ2 and dof values are for the full qinv range.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The insert plots show the data and the fit for the qinv < 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 GeV region, with the χ2 and number of bins evaluated in that region.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 0 1 2 3 4 5 6 (GeV) inv q 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='7 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='9 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 ) inv (q ss C Data Full fit Non-femto Data Full fit Non-femto ) 1 = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV (0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='607 nb NN s PbPb, CMS S 0 K Λ ⊕ S 0 K Λ 0-80% < 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV Λ / Λ T 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 < p < 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV S 0 K T 1 < p T all k : 349 2 χ dof: 289 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 (GeV) inv q 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='9 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 ) inv (q ss C : 21 2 χ # bins: 19 0 1 2 3 4 5 6 (GeV) inv q 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='6 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='6 ) inv (q ss C Data Full fit Nonfemto Data Full fit Nonfemto ) 1 = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV (0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='607 nb NN s PbPb, CMS Λ Λ ⊕ Λ Λ 0-80% < 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV T 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 < p T all k : 124 2 χ dof: 140 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 (GeV) inv q 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='6 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 1 ) inv (q ss C : 5 2 χ # bins: 9 Figure 3: The correlation distributions and fits for ΛK0 S (left) and ΛΛ (right) pairs with 0–80% centrality and no restriction on kT.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' In each plot, the red circles are the data, the blue solid line is the fit using Eq.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (8), and the green dotted line is the non-femtoscopic background from Eq.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' (7).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The χ2 and dof values are for the full qinv range.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The insert plots show the data and the fit for the qinv < 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 GeV region, with the χ2 and number of bins evaluated in that region.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 9 The selection requirements used to construct the mixed event sample are varied to require centrality matching of 3 and 7% instead of the nominal 5% and the primary vertex position matching with 1 and 3 cm instead of the nominal 2 cm.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The effect of the centrality resolution has been checked and found to be negligible.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The peak region requirement is changed from <2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='0σ to <1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5σ and <2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5σ and the sideband region selection from >4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='0σ to >3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5σ and >4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5σ.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The upper limit of the qinv fit ranges is changed by ±1 GeV and the lower limit is changed to include the first bin.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' At low pT, the tracking efficiency is strongly dependent on pT.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' There- fore, the simulated sample is used to explore possible effects of the tracking efficiency.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Based on these studies, it is found that the V0 reconstruction efficiency for the detection of two V0 particles is well described by taking the product of the efficiency for each V0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' It is also found that the fit results are only weakly affected by the V0 reconstruction efficiency.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' This is under- stood as a consequence of the signal and reference samples being similarly affected by the V0 efficiency.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Differences in the Monte Carlo and experimental pT spectra could influence the can- cellation of efficiency-dependent effects in the signal and background correlations.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Therefore, a systematic uncertainty for the efficiency is assessed by comparing the results for the default simulated sample to one in which the V0 pT distribution is reweighted to match the data.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' For the K0 SK0 S correlations, an additional systematic uncertainty is found from varying the mass and coupling parameters for the f0(980) and a0(980) resonances by using rows A, B, and D of Table 1 of Ref.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' [40].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The systematic uncertainties are summarized in Table 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Table 1: Summary of absolute systematic uncertainties in K0 SK0 S, ΛK0 S and ΛΛ correlation mea- surements.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The values for Rinv, d0, ℜ f0, and ℑ f0 are in fm.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Uncertainty source K0 SK0 S ΛK0 S ΛΛ Rinv λ Rinv d0 ℜ f0 ℑ f0 λ Rinv d0 ℜ f0 λ BDT cut 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='04–0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='18 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='01–0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='04 0.' metadata={'source': 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uncertainty 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='29–0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='47 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='08–0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='16 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='69 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='34 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='21 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='32 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='16 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='25 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='91 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='34 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='43 6 Results The size of the particle emitting source Rinv and the λ parameter extracted from the K0 SK0 S cor- relations for 0 < kT < 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV are shown as a function of centrality in Fig.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' It is observed that the Rinv value decreases from central to peripheral events, as expected from a simple geometric picture of the collisions.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Over the full centrality range of 0–80%, Rinv = 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='30 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='10 (stat) ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='37 (syst) fm.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The transverse mass can be calculated as mT = √ (minv/2)2 + k2 T, where minv is the invariant mass of the two-particle system [15].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The average ⟨mT⟩ is evaluated from the transverse mass distribution using two-particle pairs with qinv < 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 GeV, accounting for back- ground using the binomial analysis as done for the qinv distributions.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Our results for Rinv agree with the ALICE K0 SK0 S results from PbPb collisions at √sNN = 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='76 TeV at a similar mT value [47].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The λ parameter is seen to decrease from about 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='45 to 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='25 as the collisions become more pe- 10 ripheral.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' This decrease could arise from a relative increase in the contribution from resonance decays or a source function that becomes increasingly non-Gaussian as the collisions become more peripheral.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The assumption of a Gaussian source function in the LL model may also be responsible for the relatively poor fits at low qinv for the most peripheral collisions, as seen in Fig.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 0 10 20 30 40 50 60 0 1 2 3 4 5 ) 1 = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV (0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='607 nb NN s PbPb, CMS < 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV T 1 < p < 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV T 0 < k Centrality (%) (fm) inv R 0 S K 0 S K 0 10 20 30 40 50 60 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='6 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='8 1 ) 1 = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV (0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='607 nb NN s PbPb, CMS < 8.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV T 1 < p < 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 GeV T 0 < k Centrality (%) λ 0 S K 0 S K Figure 4: The Rinv (left) and λ parameter (right) as a function of centrality.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' For each data point, the line and shaded area indicate the statistical and systematic uncertainty, respectively.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Table 2 includes the extracted Rinv and λ parameters as well as ⟨mT⟩ for K0 SK0 S, ΛK0 S, and ΛΛ combinations in the 0–80% centrality range.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' A significant decrease is seen in Rinv as the ⟨mT⟩ increases.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Qualitatively similar results have been found, both for a given pair type in bins of mT and when comparing multiple pair types [1].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Because of the different minimum pT require- ments for K0 S and Λ particles, the variation in ⟨mT⟩ includes both ⟨pT⟩ and particle mass differ- ences.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The anticorrelation of Rinv and ⟨mT⟩ has been interpreted as indicating the presence of an expanding source [1].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Table 2 also includes the strong interaction scattering parameters d0, ℜ f0, and ℑ f0 obtained from the ΛK0 S and ΛΛ correlations.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Figure 5 shows d0 and ℑ f0 versus ℜ f0 in the left and right panels, respectively, with the current results shown as red stars and squares for ΛK0 S and ΛΛ, respectively.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The displayed uncertainties are one-dimensional and are not based on a two-dimensional contour.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Table 2: Extracted values of the Rinv, ℜ f0, ℑ f0, d0, λ, and ⟨mT⟩ parameters from the K0 SK0 S, ΛK0 S, and ΛΛ combinations in the 0–80% centrality range.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The first and second uncertainties are statistical and systematic, respectively.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Parameter K0 SK0 S ΛK0 S ΛΛ Rinv (fm) 3.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='30 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='10 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='37 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1+1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='7 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3+0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 ℜ f0 (fm) — −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='76+0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='29 −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='19 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='21 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='74+0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='59 −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='16 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='34 ℑ f0 (fm) — −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='07+0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='48 −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='11 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='32 — d0 (fm) — 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3+0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='7 −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 ± 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='3 4.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2+5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='7 −2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 ± 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='9 λ 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='38 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='08 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='34+0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='41 −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='12 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='16 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5+1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='2 −1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='1 ± 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='4 ⟨mT⟩ (GeV) 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='53 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='09 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='60 11 2 − 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 − 1 − 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 − 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 1 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 2 15 − 10 − 5 − 0 5 10 15 CMS AA collisions (fm) 0 f ℜ (fm) 0 d Λ Λ CMS (5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV): S 0 K Λ CMS (5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV): Λ Λ STAR (200 GeV): S 0 K Λ ALICE (2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='76 TeV): Λ Λ PRC 91, 024916: Λ Λ PRC 66, 024007: Λ Λ NPA 707, 491: 1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 − 1 − 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 − 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 − 0 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='5 1 CMS AA collisions (fm) 0 f ℜ (fm) 0 f ℑ S 0 K Λ CMS (5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV): S 0 K Λ ALICE (2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='76 TeV): Figure 5: The measured values of d0 versus ℜ f0 (left) and ℑ f0 versus ℜ f0 (right) from this analysis along with other measurements and predictions as described in the text.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' For each data point, the lines and the boxes indicate the (one-dimensional) statistical and systematic uncertainties, respectively.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The negative value of ℜ f0 observed for the ΛK0 S correlations, combined with its relatively small magnitude, suggests a repulsive ΛK0 S interaction.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The uncertainty associated with the ℑ f0 value for the ΛK0 S correlations prevents any claim concerning possible inelastic processes.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The value of ℜ f0 found for ΛK0 S correlations differs from that reported by the ALICE Collaboration (teal diamonds) [15], which is also for PbPb collisions but at √sNN = 2.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='76 TeV.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The uncertainties are too large to determine if d0 and ℑ f0 also differ between the two results.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The positive ℜ f0 value obtained for the ΛΛ correlations suggests an attractive interaction that is not strong enough to produce a bound state such as the H-dibaryon [9, 48].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' This re- sult disagrees with the finding from the STAR Collaboration in gold-gold (AuAu) collisions at √sNN = 200 GeV (blue circle).' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The negative ℜ f0 value of −1.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='10 ± 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='37 (stat)+0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='68 −0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='08 (syst) fm found by STAR, combined with its magnitude, imply a repulsive interaction.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' It is noted, however, that a theoretical study of the STAR data which considers collective flow and feed-down effects (shown as a shaded region at d0 ≈ 5 fm, ℜ f0 ≈ 0.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='9 fm) suggests that these data are consistent with the ΛΛ interaction being attractive [9].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' An exclusion plot by the ALICE Collaboration for the ΛΛ scattering parameters obtained using the ΛΛ correlations from pp collisions at √s = 7 and 13 TeV, as well as pPb collisions at √sNN = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV, also suggests an attractive interaction [10].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' In addition, our results are consistent with two theoretical calculations (black triangles) that reproduce the ΛΛ binding energy of 6 ΛΛHe, as extracted from the NAGARA event [49, 50].' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' 7 Summary The K0 SK0 S, ΛK0 S, and ΛΛ femtoscopic correlations are studied using lead-lead (PbPb) collision data at a center-of-mass energy per nucleon pair of √sNN = 5.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='02 TeV, collected by the CMS Col- laboration.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' This is the first report on ΛΛ correlations in PbPb collisions at the CERN LHC.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The source size Rinv and the incoherence parameter λ were extracted for K0 SK0 S correlations in six centrality bins covering the 0–60% range.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The value of Rinv decreases from 4 to 1 fm going from central to peripheral collisions and agrees with results from the ALICE Collaboration at a sim- ilar transverse mass.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Along with the Rinv and λ parameters, the strong interaction scattering parameters, i.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content='e.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=', the complex scattering length and effective range, were extracted from ΛK0 S and ΛΛ correlations in the 0–80% centrality range.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' These scattering parameters indicate that 12 the ΛK0 S interaction is repulsive and that the ΛΛ interaction is attractive.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The scattering param- eters obtained from ΛK0 S correlations differ from those reported by the ALICE Collaboration.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The positive real scattering length obtained from the ΛΛ correlation disfavors the existence of a bound H-dibaryon state.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' The ΛΛ scattering parameters help to constrain baryon-baryon and, more specifically, hyperon-hyperon interaction models.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' These measurements provide an additional input to understand the nature of the strong interaction between pairs of strange hadrons.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' References [1] M.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' A.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Lisa, S.' metadata={'source': '/home/zjlab/wf/langchain-ChatGLM/knowledge_base/5tE4T4oBgHgl3EQf1g0M/content/2301.05290v1.pdf'} +page_content=' Pratt, R.' metadata={'source': 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