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

Dumitru, Adrian; McLerran, Larry; Skokov, Vladimir

doi:10.1016/j.physletb.2015.02.046

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

Journal Article · Wed Apr 01 00:00:00 EDT 2015 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2015.02.046· OSTI ID:1198588

Dumitru, Adrian; McLerran, Larry; Skokov, Vladimir

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)

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-09ER41620; SC0002307; SC00112704

OSTI ID:: 1198588

Alternate ID(s):: OSTI ID: 1184845; OSTI ID: 1201358

Report Number(s):: BNL-108166-2015-JA; S0370269315001379; PII: S0370269315001379

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 743 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 69 works

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