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arXiv 0907.3062hep-phhep-thnucl-th
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大t' Hooft耦合下$Υ$的热宽度

Thermal Width of the $Υ$ at Large t' Hooft Coupling

Jorge Noronha, Adrian Dumitru

摘要:

我们使用的AdS/CFT对应表明,在强耦合等离子体中的重夸克(静态)势在有限的温度下发展的虚部。因此,当t 'Hooft耦合$λ=g^2 N_c \gg 1$和色数$N_c \to \infty$满足一定的条件时,深束缚重夸克偶子态获得了一个小的非零热宽度。在对偶引力描述中,这种假想的贡献来自于连接位于边界的重夸克的经典下垂弦底部周围的热涨落。我们预测一个强大的抑制$Υ$的重离子碰撞,并讨论如何这可能被用来估计初始温度。

英文摘要:

We use the AdS/CFT correspondence to show that the heavy quark (static) potential in a strongly-coupled plasma develops an imaginary part at finite temperature. Thus, deeply bound heavy quarkonia states acquire a small nonzero thermal width when the t'Hooft coupling $λ=g^2 N_c \gg 1$ and the number of colors $N_c \to \infty$. In the dual gravity description, this imaginary contribution comes from thermal fluctuations around the bottom of the classical sagging string in the bulk that connects the heavy quarks located at the boundary. We predict a strong suppression of $Υ$'s in heavy-ion collisions and discuss how this may be used to estimate the initial temperature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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