Forward J/ψ production in U + U collisions at √sN N = 193 GeV

Scientific paper - Original scientific paper

• Author: A. Adare
• Author: ...
• Author: Mihael Makek
• Author: ...
• Author: L. Zou
• Collaboration: PHENIX 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 invariant yields, dN/dy, for J/ψ production at forward rapidity (1.2 < |y| < 2.2) in U + U collisions at √sNN = 193 GeV have been measured as a function of collision centrality. The invariant yields and nuclearmodification factor RAA are presented and compared with those from Au + Au collisions in the same rapidity range. Additionally, the direct ratio of the invariant yields from U + U and Au + Au collisions within the same centrality class is presented, and used to investigate the role of cc¯ coalescence. Two different parametrizations of the deformed Woods-Saxon distribution were used in Glauber calculations to determine the values of the number of nucleon-nucleon collisions in each centrality class, Ncoll, and these were found to give significantly different Ncoll values. Results using Ncoll values from both deformed Woods-Saxon distributions are presented. The measured ratios show that the J/ψ suppression, relative to binary collision scaling, is similar in U + U and Au + Au for peripheral and midcentral collisions, but that J/ψ show less suppression for the most central U + U collisions. The results are consistent with a picture in which, for central collisions, increase in the J/ψ yield due to cc¯ coalescence becomes more important than the decrease in yield due to increased energy density. For midcentral collisions, the conclusions about the balance between cc¯ coalescence and suppression depend on which deformed Woods-Saxon distribution is used to determine N_coll.

• Keywords (english): QGP; J/Psi; U+U; PHENIX
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C
• Numbering: vol. 93, no. 3, 034903
• p-ISSN: 2469-9985
• DOI: https://doi.org/10.1103/PhysRevC.93.034903
• URN:NBN: urn:nbn:hr:217:623792
• Publication: 2016
• Document URL: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.93.034903
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2016 American Physical Society. Received 5 October 2015; published 3 March 2016.
• Created on: 2020-02-23 11:21:50