Quarkonia measurements with STAR |
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Authors: | Zhangbu Xu and Thomas Ullrich |
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Institution: | (1) Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA |
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Abstract: | We report results on quarkonium production from the STAR experiment at the Relativistic Heavy-Ion Collider (RHIC). J/ψ spectra in p+p and Cu+Cu collisions at
GeV with transverse momenta in the range of 0.5–14 GeV/c and 5–8 GeV/c, respectively, are presented. We find that for p
T
>5 GeV/c yields in p+p collisions are consistent with those in minimum-bias Cu+Cu collisions scaled with the respective number of binary nucleon-nucleon
collisions. In this range the nuclear modification factor, R
AA
, is measured to be 0.9±0.2 (stat). For the first time at RHIC, high-p
T
J/ψ-hadron correlations were studied in p+p collisions. Implications from our measurements on J/ψ production mechanisms, constraints on open bottom yields, and J/ψ dissociation mechanisms at high-p
T
are discussed. In addition, we give a brief status of measurements of ϒ production in p+p and Au+Au collisions and present projections of future quarkonia measurements based on an upgrades to the STAR detector and
increased luminosity achieved through stochastic cooling of RHIC. |
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Keywords: | PACS" target="_blank">PACS 25 75 Cj 25 75 Nq 12 38 Mh 14 40 Gx |
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