Abstract
The long-range two-particle correlation functions reveal the near-side ridge structures in highmultiplicity pp, pPb and PbPb collisions at the Large Hadron Collider (LHC). The model that takes into account the collective flow originated from the initial-state geometry fluctuation can successfully describe the measured long-range correlation functions of charged particles. In this review paper, the recent experimental data on the long-range correlations and the extracted elliptic and triangular flow parameters in pPb and PbPb collisions from the Compact Muon Solenoid (CMS) experiment are summarized. The flow parameters from the longrange correlation analyses are compared with those from the multiparticle cumulants and the Lee-Yang Zeros (LYZ) method. In addition, the pseudorapidity dependence of long-range two-particle correlation functions in pPb and the deduced flow parameters for identified strange hadrons (K S 0 and Λ/Λ) in pPb and PbPb are also presented to provide more insights on the long-range correlations and flow dynamics.
Highlights
The experiments at the Relativistic Heavy Ion Collider (RHIC) found the striking near-side ridge structure in the long-range two-particle correlations and the away-side coof n√icsaNlNemabiossuitoan in central AuAu decade ago [1,2,3].collisions Naturally, at 200 GeV the detailed study of the long-range two-particle correlation functions became one of the most interesting and urgent topics for the Large Hadron Collider (LHC) heavy-ion program at higher energies
4) for central 5% PbPb collisions are shown in Fig. 1 [8]
The most successful scenario is the higher-order hydrodynamics flow induced by the geometric fluctuation of the overlapped region in initial stage [9], and this idea was successfully applied to the PbPb data at the LHC [8]
Summary
The experiments at the Relativistic Heavy Ion Collider (RHIC) found the striking near-side ridge structure in the long-range two-particle correlations and the away-side coof n√icsaNlNemabiossuitoan in central AuAu decade ago [1,2,3]. The most successful scenario is the higher-order hydrodynamics flow induced by the geometric fluctuation of the overlapped region in initial stage [9], and this idea was successfully applied to the PbPb data at the LHC [8]. In this analysis, the one-dimensional Δφ projections of the two-particle correlation functions for relatively large pseudorapidity separation (2 < |Δη| < 4) are fitted by a Fourier series as.
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