Cold nuclear matter effects on J/{psi} production as constrained by deuteron-gold measurements at {radical}(s{sub NN})=200 GeV

Journal Article · Fri Feb 15 04:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.024912· OSTI ID:21068148

Adare, A; Bickley, A A; Ellinghaus, F; Kinney, E; Seele, J; Wysocki, M ^[1]; Adler, S S; Aronson, S H; Azmoun, B; Belikov, S; David, G; Desmond, E J; Franz, A; Haggerty, J S; Harvey, M; Johnson, B M; Kistenev, E; Kroon, P J; Lynch, D; Makdisi, Y I ^[2]

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1. University of Colorado, Boulder, Colorado 80309 (United States)
2. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)

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. [Phys. Rev. Lett 96, 012304 (2006)]. 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}{sub 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.

• OSTI ID: 21068148
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BROOKHAVEN RHIC
COPPER 63 REACTIONS
COPPER 63 TARGET
CROSS SECTIONS
DEUTERON REACTIONS
DEUTERONS
GEV RANGE
GLUONS
GOLD 197 REACTIONS
GOLD 197 TARGET
J PSI-3097 MESONS
MODIFICATIONS
MULTIPARTICLE SPECTROMETERS
NUCLEAR MATTER
NUCLEAR REACTION YIELD
PARTICLE IDENTIFICATION
PARTICLE RAPIDITY
PROTONS
SHADOW EFFECT