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Forward J/psi production in U plus U collisions at root S-NN=193 GeV
Physical Review C
  • Andrew Adare, University of Colorado, Boulder
  • Nicole Apadula, Iowa State University
  • Sarah C. Campbell, Iowa State University
  • Lei Ding, Iowa State University
  • John C. Hill, Iowa State University
  • Nels J. Hotvedt, Iowa State University
  • John G. Lajoie, Iowa State University
  • Alexandre Lebedev, Iowa State University
  • Craig Ogilvie, Iowa State University
  • Milap R. Patel, Iowa State University
  • Joshua Perry, Iowa State University
  • Timothy T. Rinn, Iowa State University
  • Marzia Rosati, Iowa State University
  • Alex Shaver, Iowa State University
  • M. Shimomura, Iowa State University
  • Arbin Timilsina, Iowa State University
  • Shawn Whitaker, Iowa State University
  • et al.
  • PHENIX Collaboration, PHENIX Collaboration
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Published Version
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The invariant yields, dN/dy, for J/psi production at forward rapidity (1.2 < vertical bar y vertical bar < 2.2) in U + U collisions at root S-NN = 193 GeV have been measured as a function of collision centrality. The invariant yields and nuclear-modification factor R-AA 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 c (c) over bar 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, N-coll, and these were found to give significantly different Ncoll values. Results using N-coll values from both deformed Woods-Saxon distributions are presented. The measured ratios show that the J/psi suppression, relative to binary collision scaling, is similar in U + U and Au + Au for peripheral and midcentral collisions, but that J/psi 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/psi yield due to c (c) over bar coalescence becomes more important than the decrease in yield due to increased energy density. For midcentral collisions, the conclusions about the balance between c (c) over bar coalescence and suppression depend on which deformed Woods-Saxon distribution is used to determine N-coll.

This is an article from Physical Review C 93 (2016): 034903, doi:10.1103/PhysRevC.93.034903. Posted with permission.

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American Physical Society
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Citation Information
Andrew Adare, Nicole Apadula, Sarah C. Campbell, Lei Ding, et al.. "Forward J/psi production in U plus U collisions at root S-NN=193 GeV" Physical Review C Vol. 93 Iss. 3 (2016) p. 034903
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