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Suppression and azimuthal anisotropy of prompt and nonprompt J/ψ production in PbPb collisions at √sNN=2.76 TeV


Khachatryan, V; Sirunyan, A M; Tumasyan, A; et al; Arrestad, T K; Amsler, C; Caminada, L; Canelli, M F; De Cosa, A; Galloni, C; Hinzmann, A; Hreus, T; Kilminster, B; Ngadiuba, J; Pinna, D; Rauco, G; Robmann, P; Salerno, D; Yang, Y; Zucchetta, A; et al (2017). Suppression and azimuthal anisotropy of prompt and nonprompt J/ψ production in PbPb collisions at √sNN=2.76 TeV. European Physical Journal C - Particles and Fields, 77(4):252.

Abstract

The nuclear modification factor RAA and the azimuthal anisotropy coefficient v2 of prompt and nonprompt (i.e. those from decays of b hadrons) J/ψ mesons, measured from PbPb and pp collisions at √sNN=2.76TeV at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta pT>6.5GeV/c and rapidity |y|<2.4, extending down to pT=3GeV/c in the 1.6<|y|<2.4 range. The v2 of prompt J/ψ is found to be nonzero, but with no strong dependence on centrality, rapidity, or pT over the full kinematic range studied. The measured v2 of nonprompt J/ψ is consistent with zero. The RAA of prompt J/ψ exhibits a suppression that increases from peripheral to central collisions but does not vary strongly as a function of either y or pT in the fiducial range. The nonprompt J/ψRAA shows a suppression which becomes stronger as rapidity or pT increases. The v2 and RAA of open and hidden charm, and of open charm and beauty, are compared.

Abstract

The nuclear modification factor RAA and the azimuthal anisotropy coefficient v2 of prompt and nonprompt (i.e. those from decays of b hadrons) J/ψ mesons, measured from PbPb and pp collisions at √sNN=2.76TeV at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta pT>6.5GeV/c and rapidity |y|<2.4, extending down to pT=3GeV/c in the 1.6<|y|<2.4 range. The v2 of prompt J/ψ is found to be nonzero, but with no strong dependence on centrality, rapidity, or pT over the full kinematic range studied. The measured v2 of nonprompt J/ψ is consistent with zero. The RAA of prompt J/ψ exhibits a suppression that increases from peripheral to central collisions but does not vary strongly as a function of either y or pT in the fiducial range. The nonprompt J/ψRAA shows a suppression which becomes stronger as rapidity or pT increases. The v2 and RAA of open and hidden charm, and of open charm and beauty, are compared.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2017
Deposited On:07 Jun 2017 10:31
Last Modified:05 Aug 2017 03:02
Publisher:Springer
ISSN:1434-6044
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-017-4781-1
PubMed ID:28515669

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