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Title: Azimuthal asymmetries and the emergence of “collectivity” from multi-particle correlations in high-energy pA collisions

In this study, we show how angular asymmetries ~cos2φ can arise in dipole scattering at high energies. We illustrate the effects due to anisotropic fluctuations of the saturation momentum of the target with a finite correlation length in the transverse impact parameter plane, i.e. from a domain-like structure. We compute the two-particle azimuthal cumulant in this model including both one-particle factorizable as well as genuine two-particle non-factorizable contributions to the two-particle cross section. We also compute the full BBGKY hierarchy for the four-particle azimuthal cumulant and find that only the fully factorizable contribution to c2{4} is negative while all contributions from genuine two, three and four particle correlations are positive. Our results may provide some qualitative insight into the origin of azimuthal asymmetries in p + Pb collisions at the LHC which reveal a change of sign of c2{4} in high multiplicity events. (author)
Authors:
 [1] ;  [2] ;  [3]
  1. Baruch College, New York, NY (United States); The City Univ. of New York, New York, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); China Central Normal Univ., Wuhan (China)
  3. Western Michigan Univ., Kalamazoo MI (United States)
Publication Date:
Report Number(s):
BNL-108166-2015-JA
Journal ID: ISSN 0370-2693; PII: S0370269315001379; TRN: US1601150
Grant/Contract Number:
FG02-09ER41620; SC0002307; SC00112704
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 743; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; azimuthal asymmetrics; high-energy pA collisions
OSTI Identifier:
1198588
Alternate Identifier(s):
OSTI ID: 1184845; OSTI ID: 1201358