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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Publicado: 2013
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v725_n1-3_p60_Aad
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
id paper:paper_03702693_v725_n1-3_p60_Aad
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spelling paper:paper_03702693_v725_n1-3_p60_Aad2023-06-08T15:37:13Z 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 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. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v725_n1-3_p60_Aad 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.
title Measurement with the ATLAS detector of multi-particle azimuthal correlations in p + Pb collisions at √s NN = 5.02 TeV
spellingShingle 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
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v725_n1-3_p60_Aad
http://hdl.handle.net/20.500.12110/paper_03702693_v725_n1-3_p60_Aad
_version_ 1768542271209209856

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