Centrality dependence of J<i>/ψ</i> and <i>ψ</i>(2S) production and nuclear modification in p-Pb collisions at <mml:msqrt>sNN</mml:msqrt>=8<i>.</i>16 TeV



Acharya, S, Acosta, FT, Adam, J, Adamova, D, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N
et al (show 1016 more authors) (2021) Centrality dependence of J<i>/ψ</i> and <i>ψ</i>(2S) production and nuclear modification in p-Pb collisions at <mml:msqrt>sNN</mml:msqrt>=8<i>.</i>16 TeV JOURNAL OF HIGH ENERGY PHYSICS, 2021 (2). 2-. ISSN 1126-6708, 1029-8479

Access the full-text of this item by clicking on the Open Access link.

Abstract

The inclusive production of the J/ψ and ψ(2S) charmonium states is studied as a function of centrality in p-Pb collisions at a centre-of-mass energy per nucleon pair sNN = 8.16 TeV at the LHC. The measurement is performed in the dimuon decay channel with the ALICE apparatus in the centre-of-mass rapidity intervals −4.46 < y<inf>cms</inf>< −2.96 (Pb-going direction) and 2.03 < y<inf>cms</inf>< 3.53 (p-going direction), down to zero transverse momentum (p<inf>T</inf>). The J/ψ and ψ(2S) production cross sections are evaluated as a function of the collision centrality, estimated through the energy deposited in the zero degree calorimeter located in the Pb-going direction. The p<inf>T</inf>-differential J/ψ production cross section is measured at backward and forward rapidity for several centrality classes, together with the corresponding average 〈p<inf>T</inf>〉 and 〈pT2〉 values. The nuclear effects affecting the production of both charmonium states are studied using the nuclear modification factor. In the p-going direction, a suppression of the production of both charmonium states is observed, which seems to increase from peripheral to central collisions. In the Pb-going direction, however, the centrality dependence is different for the two states: the nuclear modification factor of the J/ψ increases from below unity in peripheral collisions to above unity in central collisions, while for the ψ(2S) it stays below or consistent with unity for all centralities with no significant centrality dependence. The results are compared with measurements in p-Pb collisions at sNN = 5.02 TeV and no significant dependence on the energy of the collision is observed. Finally, the results are compared with theoretical models implementing various nuclear matter effects. [Figure not available: see fulltext.]

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron scattering (experiments)
Divisions: Faculty of Science & Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 19 Mar 2021 08:59
Last Modified: 16 Jun 2026 11:52
DOI: 10.1007/JHEP02(2021)002
Open Access URL: http://doi.org/10.1007/JHEP02(2021)002
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3117739
Disclaimer: The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate.