Cold nuclear matter effects on J/ψ production as constrained by deuteron-gold measurements at sNN=200 GeV

A. Adare et al. (PHENIX Collaboration)
Phys. Rev. C 77, 024912 – Published 28 February 2008; Erratum Phys. Rev. C 79, 059901 (2009)

Abstract

We present a new analysis of J/ψ production yields in deuteron-gold collisions at sNN=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/ψ data taken in 2005 are used to improve the baseline measurement and thus construct updated cold nuclear matter modification factors (RdAu). A suppression of J/ψ 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/ψ (or precursor) breakup cross section is added. Breakup cross sections of σbreakup=2.81.4+1.7 (2.21.5+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.

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  • Received 26 November 2007

DOI:https://doi.org/10.1103/PhysRevC.77.024912

©2008 American Physical Society

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Vol. 77, Iss. 2 — February 2008

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