%0 Generic
%A Winn, Michael
%C Heidelberg
%D 2016
%F heidok:20656
%R 10.11588/heidok.00020656
%T Inclusive J/psi production at mid-rapidity in p-Pb collisions at sqrt(s_NN)=5.02 TeV
%U https://archiv.ub.uni-heidelberg.de/volltextserver/20656/
%X Charmonia are a key observable for deconfinement in nucleus-nucleus (AA) collisions at the LHC.   Measurements in proton-nucleus (pA) collisions and their comparison with proton-proton (pp) collision results  provide complementary information  on nuclear effects that are present in the absence of the Quark-Gluon Plasma (QGP).   In addition, the calculation of the production of charmonia in pA collisions presents a challenging test of perturbative QCD at low scales Q^2 and   low fractional momentum of the involved partons.    The inclusive J/psi production in proton-lead collisions at sqrt(s_NN) = 5.02 TeV has been measured with ALICE in the ee-decay channel at mid-rapidity down to vanishing transverse momentum (p_T): integrated,     as a function of pT, centrality and charged-particle multiplicity. The nuclear modification factor of J/psi indicates a strong suppression of charmonium production integrated,    at low p_T and as function of centrality.  The  dependence of the normalised J/psi yield as a function of the normalised charged particle multiplicity is consistent with the measurement in pp collisions and in the open heavy-flavour sector. It provides information on the correlation of soft and hard particle production.     An extrapolation of the expected J/psi production behaviour in AA collisions based on the pA measurement assuming the   factorisation of the nuclear modification strengthens the evidence for an additional J/psi production component at low p_T in AA collisions. This component is expected from J/psi production from unbound charm quarks within the QGP or at the phase boundary.