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Exclusive $J/ψ$, $ψ(2⁢s)$ and e+⁢e- pair production in Au+Au ultraperipheral collisions at the BNL Relativistic Heavy Ion Collider

Journal Article · · Physical Review. C
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  1. American Univ. in Cairo, New Cairo (Egypt)
  2. Texas A&M University
  3. Czech Technical University in Prague
  4. AGH University of Krakow
  5. The Ohio State University
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  7. Variable Energy Cyclotron Centre
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  12. University of Houston
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  18. Shanghai Institute of Applied Physics
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  28. Indian Institute of Science Education and Research (IISER)
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  43. University of Chinese Academy of Sciences
  44. Central China Normal University
  45. Brookhaven National Laboratory; State University of New York
  46. University of Science and Technology of China
  47. Wayne State University
  48. Warsaw University of Technology
  49. Frankfurt Institute for Advanced Studies FIAS
  50. Lehigh University
  51. Wuhan University of Science and Technology
  52. Nuclear Physics Institute of the CAS; Czech Technical University in Prague
  53. Guangxi Normal University
  54. South China Normal University
  55. University of Texas
  56. National Institute of Science Education and Research
  57. Sejong University
  58. Rutgers University
  59. Institute of Nuclear Physics PAN
  60. Max-Planck-Institut für Physik
  61. Creighton University
  62. Ball State University; Purdue University
  63. Huzhou University
  64. Michigan State University
  65. University of California; Brookhaven National Laboratory
  66. Kent State University; Brookhaven National Laboratory
  67. Argonne National Laboratory; Valparaiso University
  68. United States Naval Academy
  69. Chongqing University
  70. Argonne National Laboratory; Brookhaven National Laboratory
+ Show Author Affiliations
Measurements of exclusive J/ψ, ψ(2⁢s), and electron-positron (e+⁢e-) pair photoproduction in Au+Au ultraperipheral collisions are reported by the STAR experiment at $$\sqrt{s_{NN}}$$ = 200GeV. Here, we report several first measurements at the BNL Relativistic Heavy Ion Collider, which are (i) J/ψ photoproduction with large momentum transfer up to 2.2⁢(GeV/c)2, (ii) coherent J/ψ photoproduction associated with neutron emissions from nuclear breakup, (iii) the rapidity dependence of incoherent J/ψ photoproduction, (iv) the ψ⁡(2⁢s) photoproduction cross section at midrapidity, and (v) e+⁢e- pair photoproduction up to high invariant mass of 6GeV/c2. For measurement (ii), the coherent J/ψ total cross section of γ + Au → J/ψ + Au as a function of the center-of-mass energy WγN has been obtained without photon energy ambiguities. The data are quantitatively compared with the Monte Carlo models STARlight, Sartre, BeAGLE, and theoretical calculations of gluon saturation with color glass condensate, nuclear shadowing with leading twist approximation, quantum electrodynamics, and the next-to-leading-order perturbative QCD. At the photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent J/ψ cross sections of Au nuclei are found to be 71% ± 10% and 36% ± 7%, respectively, of that of free protons. These data provide an important experimental constraint for nuclear parton distribution functions and a unique opportunity to advance the understanding of the nuclear modification effect at the top RHIC energy.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
AC02-06CH11357; SC0012704
OSTI ID:
2481346
Alternate ID(s):
OSTI ID: 2352728
OSTI ID: 2440098
OSTI ID: 2569582
Report Number(s):
BNL--225623-2024-JAAM; BNL--226414-2024-JAAM
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 110; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
nuclear modification
parton distribution function
ultra-peripheral collision
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