Evidence for collective multi-particle correlations in pPb collisions
CMS Collaboration

TL;DR
This study measures multi-particle azimuthal correlations in pPb and PbPb collisions, providing evidence for collective behavior and comparing results to hydrodynamic models to understand small-system dynamics.
Contribution
It extends previous correlation studies by analyzing six- and eight-particle cumulants, supporting collective effects in small collision systems like pPb.
Findings
v2 coefficients are consistent across multi-particle correlation methods
Data support a collective origin for long-range correlations
Results align with hydrodynamic predictions for small systems
Abstract
The second-order azimuthal anisotropy Fourier harmonics, v2, are obtained in pPb and PbPb collisions over a wide pseudorapidity (eta) range based on correlations among six or more charged particles. The pPb data, corresponding to an integrated luminosity of 35 inverse nanobarns, were collected during the 2013 LHC pPb run at a nucleon-nucleon center-of-mass energy of 5.02 TeV by the CMS experiment. A sample of semi-peripheral PbPb collision data at sqrt(s[NN])= 2.76 TeV, corresponding to an integrated luminosity of 2.5 inverse microbarns and covering a similar range of particle multiplicities as the pPb data, is also analyzed for comparison. The six- and eight-particle cumulant and the Lee-Yang zeros methods are used to extract the v2 coefficients, extending previous studies of two- and four-particle correlations. For both the pPb and PbPb systems, the v2 values obtained with…
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