Charm Production at RHIC

Abstract

Observations by the PHENIX and STAR collaborations suggest that a strongly coupled quark-gluon plasma is produced in heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC). After a brief introduction to heavy-ion physics, measurements of heavy-quark production in heavy-ion collisions and the modification of heavy-quark spectra by the QGP are presented. Measurements of the total charm cross-section in several different collision systems confirm that charm quark-antiquark pairs are produced through parton hard-scattering in the initial stages of the collisions. Non-photonic electrons (proxies for heavy quarks) are suppressed by about a factor of 5 in central Au + Au collisions relative to p + p collisions. This is larger than most current theoretical predictions and has lead to a re-examination of heavy-quark energy loss in the medium. The relative contributions of c and b decays to the non-photonic electron spectrum have been predicted by perturbative QCD calculations; STAR measurements of azimuthal correlation functions of non-photonic electrons and hadrons agree with these predictions.

To be published in the proceedings of CHARM07, Ithaca, NY, August 2007, eConf C070805. RevTeX v4.0, 11 pages with 12 figures; Version 2: corrected metadata, slight changes in content for clarification, additional references regarding J/psi suppression

References in corpus (5)

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• A Detailed Study of High-pT Neutral Pion Suppression and Azimuthal Anisotropy in Au+Au Collisions at \sqrt{s_{NN}} = 200 GeV
• The total charm cross section
• Measurement of the Open Charm Cross-Section in $\sqrt{s_{NN}}$ = 200 GeV Cu+Cu Collisions at STAR