报告人： 许晓明 教授 （上海大学物理系）
时 间： 5月12日（周三）上午10：00
地 点： 田家炳楼南楼203
Abstract
Various mechanisms for J/psi suppression and the recombination mechanism of charm quark and charm antiquark are reviewed. STAR collaboration has offered eminent nuclear modification factor of J/psi at high p_T and at midrapidity produced in Cu-Cu collisions at the center-of-mass energy 200 GeV. Recalling a prediction of the speaker we can understand that the feature of high-p_T nuclear modification factor is related to charm quark-antiquark pairs produced by 2-to-1 and 2-to-2 partonic processes in deconfined matter particularly in the prethermal stage and to the recombination of charm quark and charm antiquark in deconfined matter. The nuclear modification factor at high p_T is sensitive to the earliest form of deconfined matter that does not have a temperature.
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