Suppression and azimuthal anisotropy of prompt and nonprompt {J}/ψ production in PbPb collisions at √{{s_{_{ {NN}}}}} =2.76 TeV
Abstract
The nuclear modification factor R_{AA} 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 √{{s_{_{ {NN}}}}} =2.76 TeV at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta pT >6.5 {GeV}/{c} and rapidity |{y}|<2.4, extending down to pT =3 {GeV}/{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 R_{AA} 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}/ψ R_{AA} shows a suppression which becomes stronger as rapidity or pT increases. The v2 and R_{AA} of open and hidden charm, and of open charm and beauty, are compared.
- Publication:
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European Physical Journal C
- Pub Date:
- April 2017
- DOI:
- 10.1140/epjc/s10052-017-4781-1
- Bibcode:
- 2017EPJC...77..252K