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Measurement with the ATLAS detector of multi-particle azimuthal correlations in p+Pb collisions at √sNN=5.02 TeV
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ATLAS Collaboration (Including: Farrington, Sinead, Jeske, C., Jones, G. (Graham), Martin, T. A. and Pianori, E.). (2013) Measurement with the ATLAS detector of multi-particle azimuthal correlations in p+Pb collisions at √sNN=5.02 TeV. Physics Letters B, Volume 725 (Number 1-3). pp. 60-78. doi:10.1016/j.physletb.2013.06.057 ISSN 0370-2693.
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Official URL: http://dx.doi.org/10.1016/j.physletb.2013.06.057
Abstract
In order to study further the long-range correlations ("ridge") observed recently in p+Pb collisions at View the MathML source, 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 1 μb−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.
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