Rapidity dependence of initial state geometry and momentum correlations in p+Pb collisions

Jan 21, 2022
17 pages
Published in:
  • Phys.Rev.D 105 (2022) 9, 094023
  • Published: May 1, 2022
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Abstract: (APS)
Event geometry and initial state correlations have been invoked as possible explanations of long-range azimuthal correlations observed in high-multiplicity p+p and p+Pb collisions. We study the rapidity dependence of initial state momentum correlations and event-by-event geometry in s=5.02TeV p+Pb collisions within the 3+1D IP-Glasma model [B. Schenke and S. Schlichting, Phys. Rev. C 94, 044907 (2016)], where the longitudinal structure is governed by Jalilian-Marian-Iancu-McLerran-Weigert-Leonidov-Kovner rapidity evolution of the incoming nuclear gluon distributions. We find that the event geometry is correlated across large rapidity intervals whereas initial state momentum correlations are relatively short-range in rapidity. Based on our results, we discuss implications for the relevance of both effects in explaining the origin of collective phenomena in small systems.
Note:
  • 17 pages, 14 figures
  • momentum: correlation
  • angular correlation: long-range
  • multiplicity: high
  • p nucleus: scattering
  • initial state: correlation
  • rapidity dependence
  • longitudinal
  • short-range
  • collective phenomena
  • numerical calculations