Measurement with the ATLAS detector of multi-particle azimuthal correlations in p + Pb collisions at √s NN = 5.02 TeV
In order to study further the long-range correlations ("ridge") observed recently in p + Pb collisions at √s NN = 5.02 TeV, the second-order azimuthal anisotropy parameter of charged particles, v 2 , has been measured with the cumulant method using the ATLAS detector at the LHC. In a data...
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| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03702693_v725_n1-3_p60_Aad |
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| Sumario: | In order to study further the long-range correlations ("ridge") observed recently in p + Pb collisions at √s NN = 5.02 TeV, the second-order azimuthal anisotropy parameter of charged particles, v 2 , 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 v 2 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 v 2 and its similarity to hydrodynamic predictions provide additional evidence for the importance of final-state effects in p + Pb reactions. © 2013 CERN. Published by Elsevier B.V. |
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