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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Autor principal: Aad, G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03702693_v725_n1-3_p60_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_03702693_v725_n1-3_p60_Aad2023-10-03T15:29:32Z Measurement with the ATLAS detector of multi-particle azimuthal correlations in p + Pb collisions at √s NN = 5.02 TeV Aad, G. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03702693_v725_n1-3_p60_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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.
format JOUR
author Aad, G.
spellingShingle Aad, G.
Measurement with the ATLAS detector of multi-particle azimuthal correlations in p + Pb collisions at √s NN = 5.02 TeV
author_facet Aad, G.
author_sort Aad, G.
title Measurement with the ATLAS detector of multi-particle azimuthal correlations in p + Pb collisions at √s NN = 5.02 TeV
title_short Measurement with the ATLAS detector of multi-particle azimuthal correlations in p + Pb collisions at √s NN = 5.02 TeV
title_full Measurement with the ATLAS detector of multi-particle azimuthal correlations in p + Pb collisions at √s NN = 5.02 TeV
title_fullStr Measurement with the ATLAS detector of multi-particle azimuthal correlations in p + Pb collisions at √s NN = 5.02 TeV
title_full_unstemmed Measurement with the ATLAS detector of multi-particle azimuthal correlations in p + Pb collisions at √s NN = 5.02 TeV
title_sort measurement with the atlas detector of multi-particle azimuthal correlations in p + pb collisions at √s nn = 5.02 tev
url http://hdl.handle.net/20.500.12110/paper_03702693_v725_n1-3_p60_Aad
work_keys_str_mv AT aadg measurementwiththeatlasdetectorofmultiparticleazimuthalcorrelationsinppbcollisionsatsnn502tev
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