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Type: Journal article
Title: Measurement with the ATLAS detector of multi-particle azimuthal correlations in p+Pb collisions at √sNN= 5.02 TeV
Other Titles: Measurement with the ATLAS detector of multi-particle azimuthal correlations in p+Pb collisions at root sNN= 5.02 TeV
Author: Jackson, P.
Soni, N.
White, M.
Citation: Physics Letters B, 2013; 725(1-3):60-78
Publisher: Elsevier Science BV
Issue Date: 2013
ISSN: 0370-2693
Contributor: Jackson, Paul Douglas
Soni, Nitesh
White, Martin
Statement of
ATLAS Collaboration
Abstract: In order to study further the long-range correlations ("ridge") observed recently in p+Pb collisions at sNN=5.02TeV, the second-order azimuthal anisotropy parameter of charged particles, v2, has been measured with the cumulant method using the ATLAS detector at the LHC. In a data sample corresponding to an integrated luminosity of approximately 1μb⁻¹, the parameter v2 has been obtained using two- and four-particle cumulants over the pseudorapidity range |η|<2.5. The results are presented as a function of transverse momentum and the event activity, defined in terms of the transverse energy summed over 3.1<η<4.9 in the direction of the Pb beam. They show features characteristic of collective anisotropic flow, similar to that observed in Pb+Pb collisions. A comparison is made to results obtained using two-particle correlation methods, and to predictions from hydrodynamic models of p+Pb collisions. Despite the small transverse spatial extent of the p+Pb collision system, the large magnitude of v2 and its similarity to hydrodynamic predictions provide additional evidence for the importance of final-state effects in p+Pb reactions.
Description: ATLAS Collaboration members: P. Jackson, N. Soni, M.J. White for the University of Adelaide, South Australia.
Rights: © 2013 CERN.
RMID: 0020132452
DOI: 10.1016/j.physletb.2013.06.057
Appears in Collections:Chemistry and Physics publications

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