Cold Nuclear Matter Effects on J/{psi} Production as Constrained by Deuteron-Gold Measurements at s_NN = 200 GeV
- University of Colorado, Boulder
- ORNL
- University of Tennessee, Knoxville (UTK)
We present a new analysis of J/{psi} production yields in deuteron-gold collisions at {radical}s{sub NN}=200 GeV using data taken from the PHENIX experiment in 2003 and previously published in S. S. Adler et al. The high statistics proton-proton J/psi data taken in 2005 are used to improve the baseline measurement and thus construct updated cold nuclear matter modification factors (R{sub dAu}). A suppression of J/psi in cold nuclear matter is observed as one goes forward in rapidity (in the deuteron-going direction), corresponding to a region more sensitive to initial-state low-x gluons in the gold nucleus. The measured nuclear modification factors are compared to theoretical calculations of nuclear shadowing to which a J/psi (or precursor) breakup cross section is added. Breakup cross sections of {sigma}breakup=2.8{sub -1.4}{sup +1.7} (2.2{sub -1.5}{sup +1.6}) mb are obtained by fitting these calculations to the data using two different models of nuclear shadowing. These breakup cross-section values are consistent within large uncertainties with the 4.2{+-}0.5 mb determined at lower collision energies. Projecting this range of cold nuclear matter effects to copper-copper and gold-gold collisions reveals that the current constraints are not sufficient to firmly quantify the additional hot nuclear matter effect.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 931104
- Journal Information:
- Physical Review C, Vol. 77, Issue 2; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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