Prompt and non-prompt J/ψ elliptic flow in Pb+Pb collisions at √sNN=5.02 Tev with the ATLAS detector /M. Aaboud, G. Aad, B. Abbott и др.

Электронный ресурс
Другой Автор
Aad, G.
Abbott, B.
Chelkov, G. A.
Khodinov, A.
Parida, B.
Tsybychev, D.
Vaniachine, A.
Aaboud, M.
Источник
The European physical journal C 2018 Vol. 78, № 9. P. 784 (1-23)
Аннотация
The elliptic flow of prompt and non-prompt J/ψJ/ψ was measured in the dimuon decay channel in Pb+Pb collisions at sNN−−−√=5.02sNN=5.02 TeVTeV with an integrated luminosity of 0.42 nb−10.42 nb−1 with the ATLAS detector at the LHC. The prompt and non-prompt signals are separated using a two-dimensional simultaneous fit of the invariant mass and pseudo-proper decay time of the dimuon system from the J/ψJ/ψ decay. The measurement is performed in the kinematic range of dimuon transverse momentum and rapidity 9<pT<309<pT<30 GeVGeV, |y|<2|y|<2, and 0–60% collision centrality. The elliptic flow coefficient, v2v2, is evaluated relative to the event plane and the results are presented as a function of transverse momentum, rapidity and centrality. It is found that prompt and non-prompt J/ψJ/ψ mesons have non-zero elliptic flow. Prompt J/ψJ/ψ v2v2decreases as a function of pTpT, while for non-prompt J/ψJ/ψ it is, with limited statistical significance, consistent with a flat behaviour over the studied kinematic region. There is no observed dependence on rapidity or centrality.
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Предмет
статьи в журналах
Резюме
The elliptic flow of prompt and non-prompt J/ψJ/ψ was measured in the dimuon decay channel in Pb+Pb collisions at sNN−−−√=5.02sNN=5.02 TeVTeV with an integrated luminosity of 0.42 nb−10.42 nb−1 with the ATLAS detector at the LHC. The prompt and non-prompt signals are separated using a two-dimensional simultaneous fit of the invariant mass and pseudo-proper decay time of the dimuon system from the J/ψJ/ψ decay. The measurement is performed in the kinematic range of dimuon transverse momentum and rapidity 9<pT<309<pT<30 GeVGeV, |y|<2|y|<2, and 0–60% collision centrality. The elliptic flow coefficient, v2v2, is evaluated relative to the event plane and the results are presented as a function of transverse momentum, rapidity and centrality. It is found that prompt and non-prompt J/ψJ/ψ mesons have non-zero elliptic flow. Prompt J/ψJ/ψ v2v2decreases as a function of pTpT, while for non-prompt J/ψJ/ψ it is, with limited statistical significance, consistent with a flat behaviour over the studied kinematic region. There is no observed dependence on rapidity or centrality.