Rapidity and transverse-momentum dependence of the inclusive J/ψ\psi nuclear modification factor in p-Pb collisions at sN N= \sqrt{s_{N\ N}} = 5.02 TeV

Collaboration
Mar 24, 2015
27 pages
Published in:
  • JHEP 06 (2015) 055
  • Published: Jun 9, 2015
e-Print:
Report number:
  • CERN-PH-EP-2015-030
Experiments:

Citations per year

20152018202120242025051015202530
Abstract: (Springer)
We have studied the transverse-momentum (pT_{T}) dependence of the inclusive J/ψ production in p-Pb collisions at sNN \sqrt{s_{\mathrm{NN}}} = 5.02 TeV, in three center-of-mass rapidity (ycms_{cms}) regions, down to zero pT_{T}. Results in the forward and backward rapidity ranges (2.03 < ycms_{cms} < 3.53 and −4.46 < ycms_{cms} < −2.96) are obtained by studying the J/ψ decay to μ+^{+} μ^{−} , while the mid-rapidity region (−1.37 < ycms_{cms} < 0.43) is investigated by measuring the e+^{+}e^{−} decay channel. The pT_{T} dependence of the J/ψ production cross section and nuclear modification factor are presented for each of the rapidity intervals, as well as the J/ψ mean pT_{T} values. Forward and mid-rapidity results show a suppression of the J/ψ yield, with respect to pp collisions, which decreases with increasing pT_{T}. At backward rapidity no significant J/ψ suppression is observed. Theoretical models including a combination of cold nuclear matter effects such as shadowing and partonic energy loss, are in fair agreement with the data, except at forward rapidity and low transverse momentum. The implications of the p-Pb results for the evaluation of cold nuclear matter effects on J/ψ production in Pb-Pb collisions are also discussed.
Note:
  • Hadron-Hadron Scattering
  • Relativistic heavy ion physics
  • Heavy ions
  • Charm physics
  • transverse momentum dependence
  • rapidity
  • J/psi(3100)
  • nuclear matter: effect
  • inclusive production
  • differential cross section