<em>ψ</em>(2S) Production in p-Pb and Pb-Pb Collisions with the ALICE Experiment

Abstract

The inclusive production of the charmonium state ψ ( 2 S ) was studied in p-Pb and Pb-Pb collisions at s NN = 8.16 TeV and 5.02 TeV respectively, using the ALICE detector at the CERN LHC. The ψ ( 2 S ) is less bound than the J / ψ and it represents an interesting probe for the study of cold nuclear matter effects in p-Pb collisions, while in the Pb-Pb system its formation can be strongly influenced by QGP production. The measurements are performed in different center-of-mass rapidity ranges, 2.03 < y cms < 3.53 and −4.46 < y cms < −2.96 for p-Pb collisions and 2.5 < y cms < 4.0 for Pb-Pb collisions, down to zero transverse momentum, through the ψ ( 2 S ) → μ + μ - decay channel. The results are compared to those obtained for the J / ψ and with theoretical predictions.

Keywords

• quarkonia
• ψ(2S)
• J/ψ
• Quark-Gluon Plasma
• cold nuclear matter effects