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gamma (1S+2S+3S) production in d plus Au and p plus p collisions at root s(NN)=200 GeV and cold-nuclear-matter effects
Physical Review C
  • Andrew Adare, University of Colorado, Boulder
  • Alan Dion, Iowa State University
  • John C. Hill, Iowa State University
  • Todd Kempel, Iowa State University
  • John G. Lajoie, Iowa State University
  • Alexandre Lebedev, Iowa State University
  • Craig Ogilvie, Iowa State University
  • H. Pei, Iowa State University
  • Marzia Rosati, Iowa State University
  • Alexey Yu. Semenov, Iowa State University
  • C. L. Silva, Iowa State University
  • Carla Vale, Iowa State University
  • Feng Wei, Iowa State University
  • et al.
  • PHENIX Collaboration, PHENIX Collaboration
Document Type
Article
Disciplines
Publication Version
Published Version
Publication Date
4-25-2013
DOI
10.1103/PhysRevC.87.044909
Abstract
The three gamma states, gamma (1S + 2S + 3S), are measured in d + Au and p + p collisions at root s(NN) = 200 GeV and rapidities 1.2 < vertical bar y vertical bar < 2.2 by the PHENIX experiment at the Relativistic Heavy Ion Collider. Cross sections for the inclusive gamma (1S + 2S + 3S) production are obtained. The inclusive yields per binary collision for d + Au collisions relative to those in p + p collisions (R-dAu) are found to be 0.62 +/- 0.26 (stat) +/- 0.13 (syst) in the gold-going direction and 0.91 +/- 0.33 (stat) +/- 0.16 (syst) in the deuteron-going direction. The measured results are compared to a nuclear-shadowing model, EPS09 [Eskola et al., J. High Energy Phys. 04 (2009) 065], combined with a final-state breakup cross section, sigma(br), and compared to lower energy p + A results. We also compare the results to the PHENIX J/psi results [Adare et al., Phys. Rev. Lett. 107, 142301 (2011)]. The rapidity dependence of the observed gamma suppression is consistent with lower energy p + A measurements.
Comments

This is an article from Physical Review C 87 (2013): 044909-1, doi:10.1103/PhysRevC.87.044909. Posted with permission.

Copyright Owner
American Physical Society
Language
en
File Format
application/pdf
Citation Information
Andrew Adare, Alan Dion, John C. Hill, Todd Kempel, et al.. "gamma (1S+2S+3S) production in d plus Au and p plus p collisions at root s(NN)=200 GeV and cold-nuclear-matter effects" Physical Review C Vol. 87 Iss. 4 (2013) p. 044909
Available at: http://works.bepress.com/craig-ogilvie/98/