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Evidence for Collective Multiparticle Correlations in p-Pb Collisions.

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  • 1Yerevan Physics Institute, Yerevan, Armenia.

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|July 17, 2015
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Summary
This summary is machine-generated.

Measurements of second-order azimuthal anisotropy (v2) in proton-lead (p-Pb) and lead-lead (PbPb) collisions confirm a collective origin for long-range correlations. These findings offer insights into multiparticle dynamics in small collision systems.

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Area of Science:

  • High-energy nuclear physics
  • Quantum chromodynamics
  • Particle physics

Background:

  • Proton-lead (p-Pb) and lead-lead (PbPb) collisions probe the behavior of nuclear matter under extreme conditions.
  • Previous studies observed long-range correlations in these systems, suggesting a collective phenomenon.

Purpose of the Study:

  • To measure the second-order azimuthal anisotropy (v2) using multi-particle correlations in p-Pb and PbPb collisions.
  • To investigate the collective origin of long-range correlations by extending analyses to higher-order particle correlations.
  • To compare experimental results with theoretical predictions for hydrodynamic behavior in small systems.

Main Methods:

  • Analysis of charged particle correlations in p-Pb and PbPb collisions using data from the CMS experiment.
  • Application of six- and eight-particle cumulant methods and the Lee-Yang zeros method to extract v2 coefficients.
  • Comparison of v2 values from multi-particle correlations with previous two- and four-particle results.

Main Results:

  • v2 values extracted from correlations involving six or more particles are consistent with those from four-particle correlations in both p-Pb and PbPb systems.
  • The consistency supports the interpretation of a collective origin for long-range correlations.
  • Ratios of v2 values are compared to theoretical models, providing insights into hydrodynamic behavior in p-Pb collisions.

Conclusions:

  • The study confirms the collective nature of long-range correlations in both p-Pb and PbPb collisions.
  • The results provide valuable constraints on theoretical models describing the multiparticle dynamics of small collision systems.
  • This research enhances our understanding of the interplay between initial state fluctuations and final state effects in heavy-ion physics.