重离子碰撞中Charmonia的有序再生
Sequential Regeneration of Charmonia in Heavy-Ion Collisions
摘要：
本文研究了RHIC和LHC能区核碰撞中ψ（2S）的产生。我们首先解决粲偶素生产在200 GeV的d-Au碰撞在RHIC，在这些反应中观察到的psi'介子的强烈抑制表明机制超出了最初的冷核物质的影响。我们发现，一个更完整的处理强子离解反应导致明显的psi的抑制在强子介质中的一个扩大的火球背景的d-Au碰撞。当在LHC上对2.76 TeV的Pb-Pb碰撞实施更新的强子反应速率到火球中时，psi'介子的再生明显晚于J/psi的再生。尽管再生的psi '的总数较小，但在它们产生时的较强径向流引起它们的R_{AA}相对于J/psi的在动量范围p_t \simeq 3-6 GeV内的显著增强。我们探讨了这种“顺序再生”机制对R_{AA}双比的影响和不确定性，发现它可以重现最近CMS数据中观察到的趋势。
英文摘要：
We investigate the production of psi(2S) in nuclear collisions at RHIC and LHC energies. We first address charmonium production in 200 GeV d-Au collisions at RHIC; the strong suppression of psi' mesons observed in these reactions indicates mechanisms beyond initial cold nuclear matter effects. We find that a more complete treatment of hadronic dissociation reactions leads to appreciable psi' suppression in the hadronic medium of an expanding fireball background for d-Au collisions. When implementing the updated hadronic reaction rates into a fireball for 2.76 TeV Pb-Pb collisions at LHC, the regeneration of psi' mesons occurs significantly later than for J/psi's. Despite a smaller total number of regenerated psi', the stronger radial flow at their time of production induces a marked enhancement of their R_{AA} relative to J/psi's in a momentum range p_t \simeq 3-6 GeV. We explore the consequences and uncertainties of this "sequential regeneration" mechanism on the R_{AA} double ratio and find that it can reproduce the trends observed in recent CMS data.
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