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

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 p_T > 6.5 GeV/c and rapidity |y| < 2.4, extending down to p_T = 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 p_T 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 p_T in the fiducial range. The nonprompt J/ψ R_AA shows a suppression which becomes stronger as rapidity or p_T increases. The v₂ and R_AA of open and hidden charm, and of open charm and beauty, are compared.