/ Experiment-Nucl arXiv:0711.3917


Cold Nuclear Matter Effects on J/Psi as Constrained by Deuteron-Gold Measurements at s(NN)**(1/2) = 200-GeV


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Published in: Phys.Rev. / Erratum-ibid.
Year: 2008 / 2009
Vol.: C77 / C79
Page No: 024912 / 059901
Pages: 15

Abstract: We present a new analysis of J/psi production yields in deuteron-gold collisions at sqrt(s_NN) = 200 GeV using data taken by 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 is used to improve the baseline measurement and thus construct updated cold nuclear matter modification factors R_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) break-up cross-section is added. Breakup cross sections of sigma_breakup = 2.8^[+1.7_-1.4] (2.2^[+1.6_-1.5]) 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.
All of the experimental data points presented in the original paper are correct and unchanged (including statistical and systematic uncertainties). However, herein we correct a comparison between the experimental data and a theoretical picture, because we discovered a mistake in the code used. All of the most probable sigma_breakup values differ by less than 0.4 mb from those originally presented. However, the one standard deviation uncertainties (that include contributions from both the statistical and systematic uncertainties on the experimental data points) are approximately 30-60% larger than originally reported. We give a table of the new comparison results and corrected versions of Figs. 8-11 of the original paper and we note that no correction is needed for results from the data-driven method in Fig. 13.

Web-Page: http://link.aps.org/abstract/PRC/V77/E024912; http://inspirebeta.net/record/768530/files/figure_dau_ncoll_theory_compare.png; http://inspirebeta.net/record/768530/files/rauau_forw_theory.png; http://inspirebeta.net/record/768530/files/rauau_mid_theory.png; http://inspirebeta.net/record/768530/files/rcucu_forw_theory.png; http://inspirebeta.net/record/768530/files/rcucu_mid_theory.png; http://inspirebeta.net/record/768530/files/rdau_eksmodel.png; http://inspirebeta.net/record/768530/files/rdau_ndsgmodel.png

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