Cold nuclear matter effects on J/{psi} production as constrained by deuteron-gold measurements at {radical}(s{sub NN})=200 GeV
- University of Colorado, Boulder, Colorado 80309 (United States)
- 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, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevC.77.024912; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). PHENIX Collaboration; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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