Azimuthal asymmetries and the emergence of “collectivity” from multi-particle correlations in high-energy pA collisions
Abstract
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:
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1198588
- Alternate Identifier(s):
- OSTI ID: 1184845; OSTI ID: 1201358
- Report Number(s):
- BNL-108166-2015-JA
Journal ID: ISSN 0370-2693; S0370269315001379; PII: S0370269315001379
- Grant/Contract Number:
- FG02-09ER41620; SC0002307; SC00112704
- Resource Type:
- Published Article
- Journal Name:
- Physics Letters. B
- Additional Journal Information:
- Journal Name: Physics Letters. B Journal Volume: 743 Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; azimuthal asymmetrics; high-energy pA collisions
Citation Formats
Dumitru, Adrian, McLerran, Larry, and Skokov, Vladimir. Azimuthal asymmetries and the emergence of “collectivity” from multi-particle correlations in high-energy pA collisions. Netherlands: N. p., 2015.
Web. doi:10.1016/j.physletb.2015.02.046.
Dumitru, Adrian, McLerran, Larry, & Skokov, Vladimir. Azimuthal asymmetries and the emergence of “collectivity” from multi-particle correlations in high-energy pA collisions. Netherlands. https://doi.org/10.1016/j.physletb.2015.02.046
Dumitru, Adrian, McLerran, Larry, and Skokov, Vladimir. Wed .
"Azimuthal asymmetries and the emergence of “collectivity” from multi-particle correlations in high-energy pA collisions". Netherlands. https://doi.org/10.1016/j.physletb.2015.02.046.
@article{osti_1198588,
title = {Azimuthal asymmetries and the emergence of “collectivity” from multi-particle correlations in high-energy pA collisions},
author = {Dumitru, Adrian and McLerran, Larry and Skokov, Vladimir},
abstractNote = {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)},
doi = {10.1016/j.physletb.2015.02.046},
journal = {Physics Letters. B},
number = C,
volume = 743,
place = {Netherlands},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}
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https://doi.org/10.1016/j.physletb.2015.02.046
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