J/ψ Production and Nuclear Effects for D+Au and P+P Collisions in PHENIX at RHIC

Details J/ψ Production and Nuclear Effects for D+Au and P+P Collisions in PHENIX at RHIC J/ψ Production and Nuclear Effects for D+Au and P+P Collisions in PHENIX at RHIC

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005fuin.conf..220l&link_type=abstract

FUNDAMENTAL INTERACTIONS. Proceedings of the Nineteenth Lake Louise Winter Institute. Held 15-21 February 2004 in Lake Louise, A

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J/ψ production from nuclei is a sensitive probe of the gluon structure function and its modification in nuclei. It is also a leading signal for the creation of hot-dense matter in heavy-ion collisions. At RHIC, gluons are probed that lie deep in the shadowing region. Leading models of gluon shadowing predict suppressions of J/ψ production in nuclei that differ by as much as a factor of three. Data from PHENIX during the recent d-Au and companion p-p runs allow us to explore the level of gluon shadowing and other nuclear effects such as cbar {c} absorption. These measurements also serve as a baseline for the upcoming results from the high-luminosity Au-Au run and must be understood in order to look for effects beyond what is expected from cold nuclear matter, such as the creation of a Quark Gluon Plasma. PHENIX has reconstructed over 2000 J/ψ's detected via their decays into both e+e- and μ+μ-, covering rapidities between -2.2 and +2.4 for both p-p and d-Au collisions at √ {sNN} = 200GeV. The nuclear dependence of J/ψ production versus rapidity, pT, and impact parameter are obtained by comparison of the d-Au and p-p data. These results are compared to lower energy p-A results from Fermilab and to theoretical models.

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