Centrality dependence of J/ψ and ψ(2S) production and nuclear modification in p-Pb collisions at √sNN = 8.16 TeV

Scientific paper - Original scientific paper

• Author: S. Acharya
• Author: ...
• Author: Tome Antičić
• Author: ...
• Author: Frank Erhardt
• Author: ...
• Author: Sven Gotovac
• Author: ...
• Author: Marko Jerčić
• Author: ...
• Author: David Karatović
• Author: ...
• Author: Petra Lončar
• Author: ...
• Author: Eugen Mudnić
• Author: ...
• Author: Mirko Planinić
• Author: ...
• Author: Nikola Poljak
• Author: ...
• Author: Linda Vicković
• Author: ...
• Author: N. Zurlo
• Collaboration: ALICE Collaboration
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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_cms < −2.96 (Pb- going direction) and 2.03 < y_cms < 3.53 (p-going direction), down to zero transverse momentum (pT). 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 pT-differential J/ψ production cross section is measured at backward and forward rapidity for several centrality classes, together with the corresponding average 〈pT〉 and ⟨p2T⟩ 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.

• Keywords (english): Hadron-Hadron scattering (experiments); J/psi(3100): production; psi(3685): production; p nucleus: scattering; charmonium: production; cross section: measured; nuclear matter: effect; dimuon: decay; calorimeter: forward spectrometer; impact parameter; peripheral; rapidity; inclusive production; transverse momentum; CERN LHC Coll; ALICE; experimental results; 8160 GeV-cms/nucleon
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Journal of High Energy Physics
• Numbering: vol. 2021, no. 02, 002
• e-ISSN: 1029-8479
• DOI: https://doi.org/10.1007/JHEP02(2021)002
• URN:NBN: urn:nbn:hr:217:594300
• Publication: 2021-02-01
• Document URL: https://link.springer.com/10.1007/JHEP02(2021)002
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Received: October 11, 2020. Accepted: November 30, 2020. Published: February 1, 2021. .
• Created on: 2024-09-24 20:30:47