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Measurement of J/ψ at forward and backward rapidity in p+p, p+Al, p+Au, and He 3 +Au collisions at sNN =200 GeV

Acharya, U. ; Oskarsson, A. LU ; Silvermyr, D. LU orcid ; Zhou, S. and Zou, L. (2020) In Physical Review C 102(1).
Abstract
Charmonium is a valuable probe in heavy-ion collisions to study the properties of the quark gluon plasma, and is also an interesting probe in small collision systems to study cold nuclear matter effects, which are also present in large collision systems. With the recent observations of collective behavior of produced particles in small system collisions, measurements of the modification of charmonium in small systems have become increasingly relevant. We present the results of J/ψ measurements at forward and backward rapidity in various small collision systems, p+p, p+Al, p+Au, and He3+Au, at sNN=200 GeV. The results are presented in the form of the observable RAB, the nuclear modification factor, a measure of the ratio of the J/ψ... (More)
Charmonium is a valuable probe in heavy-ion collisions to study the properties of the quark gluon plasma, and is also an interesting probe in small collision systems to study cold nuclear matter effects, which are also present in large collision systems. With the recent observations of collective behavior of produced particles in small system collisions, measurements of the modification of charmonium in small systems have become increasingly relevant. We present the results of J/ψ measurements at forward and backward rapidity in various small collision systems, p+p, p+Al, p+Au, and He3+Au, at sNN=200 GeV. The results are presented in the form of the observable RAB, the nuclear modification factor, a measure of the ratio of the J/ψ invariant yield compared to the scaled yield in p+p collisions. We examine the rapidity, transverse momentum, and collision centrality dependence of nuclear effects on J/ψ production with different projectile sizes p and He3, and different target sizes Al and Au. The modification is found to be strongly dependent on the target size, but to be very similar for p+Au and He3+Au. However, for 0%-20% central collisions at backward rapidity, the modification factor for He3+Au is found to be smaller than that for p+Au, with a mean fit to the ratio of 0.89±0.03(stat)±0.08(syst), possibly indicating final state effects due to the larger projectile size. © 2020 authors. Published by the American Physical Society. (Less)
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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
102
issue
1
article number
014902
publisher
American Physical Society
external identifiers
  • scopus:85089309292
ISSN
2469-9985
DOI
10.1103/PhysRevC.102.014902
language
English
LU publication?
yes
id
b5e35334-2cfe-42ae-9cb8-394379045656
date added to LUP
2022-04-07 10:11:54
date last changed
2023-04-02 22:44:34
@article{b5e35334-2cfe-42ae-9cb8-394379045656,
  abstract     = {{Charmonium is a valuable probe in heavy-ion collisions to study the properties of the quark gluon plasma, and is also an interesting probe in small collision systems to study cold nuclear matter effects, which are also present in large collision systems. With the recent observations of collective behavior of produced particles in small system collisions, measurements of the modification of charmonium in small systems have become increasingly relevant. We present the results of J/ψ measurements at forward and backward rapidity in various small collision systems, p+p, p+Al, p+Au, and He3+Au, at sNN=200 GeV. The results are presented in the form of the observable RAB, the nuclear modification factor, a measure of the ratio of the J/ψ invariant yield compared to the scaled yield in p+p collisions. We examine the rapidity, transverse momentum, and collision centrality dependence of nuclear effects on J/ψ production with different projectile sizes p and He3, and different target sizes Al and Au. The modification is found to be strongly dependent on the target size, but to be very similar for p+Au and He3+Au. However, for 0%-20% central collisions at backward rapidity, the modification factor for He3+Au is found to be smaller than that for p+Au, with a mean fit to the ratio of 0.89±0.03(stat)±0.08(syst), possibly indicating final state effects due to the larger projectile size. © 2020 authors. Published by the American Physical Society.}},
  author       = {{Acharya, U. and Oskarsson, A. and Silvermyr, D. and Zhou, S. and Zou, L.}},
  issn         = {{2469-9985}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Measurement of J/ψ at forward and backward rapidity in p+p, p+Al, p+Au, and He 3 +Au collisions at sNN =200 GeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.102.014902}},
  doi          = {{10.1103/PhysRevC.102.014902}},
  volume       = {{102}},
  year         = {{2020}},
}