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Forward J/ψ production in U + U collisions at sNN =193 GeV

Adare, A. ; Christiansen, Peter LU ; Oskarsson, Anders LU ; Silvermyr, David LU orcid ; Stenlund, Evert LU and Zou, L. (2016) In Physical Review C 93(3).
Abstract
The invariant yields, dN/dy, for J/ψ production at forward rapidity (1.2<|y|<2.2) in U+U collisions at sNN=193GeV have been measured as a function of collision centrality. The invariant yields and nuclear-modification 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... (More)
The invariant yields, dN/dy, for J/ψ production at forward rapidity (1.2<|y|<2.2) in U+U collisions at sNN=193GeV have been measured as a function of collision centrality. The invariant yields and nuclear-modification 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 Ncoll. (Less)
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author
; ; ; ; and
author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
93
issue
3
article number
034903
publisher
American Physical Society
external identifiers
  • scopus:84960540423
ISSN
2469-9985
DOI
10.1103/PhysRevC.93.034903
language
English
LU publication?
yes
id
727af2b2-9ec1-4b5d-b785-8a5fc6dd2ad2
date added to LUP
2022-03-31 14:52:32
date last changed
2023-04-02 23:07:47
@article{727af2b2-9ec1-4b5d-b785-8a5fc6dd2ad2,
  abstract     = {{The invariant yields, dN/dy, for J/ψ production at forward rapidity (1.2&lt;|y|&lt;2.2) in U+U collisions at sNN=193GeV have been measured as a function of collision centrality. The invariant yields and nuclear-modification 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 Ncoll.}},
  author       = {{Adare, A. and Christiansen, Peter and Oskarsson, Anders and Silvermyr, David and Stenlund, Evert and Zou, L.}},
  issn         = {{2469-9985}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Forward J/ψ production in U + U collisions at sNN =193 GeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.93.034903}},
  doi          = {{10.1103/PhysRevC.93.034903}},
  volume       = {{93}},
  year         = {{2016}},
}