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arXiv 1606.08421nucl-thhep-ph
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高温下连续生产底鎓

Sequential bottomonium production at high temperatures

P. Petreczky, C. Young

摘要:

与任何简单的从基元碰撞推断的结果相比,重离子碰撞中底鎓的产生被修正了。这种改变很可能是由于夸克和胶子的退禁闭系统的存在,其时间为几个fm/c。在这样的介质中,底夸克可能会被摧毁,但由于系统中的平均自由程很小,组成底夸克的物质可能会保持空间相关。考虑到这些事实,我们描述bottomonium形成与一组耦合的方程。速率方程描述了$Υ(1S)$粒子的破坏,而朗之万方程描述了底夸克如何在足够长的时间内保持关联,从而有可能重组成底夸克。我们表明,在这种方法中,它是可以理解的重离子碰撞中的$Υ(1S)$抑制的幅度和$Υ(2S)$状态的较大的抑制,这意味着在重离子碰撞中的$Υ(1S)/Υ(2S)$产率的比率的减少不一定对应于顺序熔化的图片。

英文摘要:

Bottomonium production in heavy ion collisions is modified compared with any simple extrapolation from elementary collisions. This modification is most likely caused by the presence of a deconfined system of quarks and gluons for times of several fm/c. In such a medium, bottomonium can be destroyed, but the constituent bottom quarks will likely stay spatially correlated due to small mean free paths in this system. With these facts in mind, we describe bottomonium formation with a coupled set of equations. A rate equation describes the destruction of $Υ(1S)$ particles, while a Langevin equation describes how the bottom quarks stay correlated for a sufficiently long time so that recombination into bottomonia is possible. We show that within this approach it is possible to understand the magnitude of $Υ(1S)$ suppression in heavy ion collisions and the larger suppression of the $Υ(2S)$ state, implying that the reduction in the ratio of $Υ(1S)/Υ(2S)$ yield in heavy ion collision does not necessarily correspond to sequential melting picture.

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