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arXiv 0907.1041hep-ph
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Charmonia在热平衡介质中的性质

Properties of charmonia in a hot equilibrated medium

Floriana Giannuzzi, Massimo Mannarelli

备注：
minor changes, references added, almost matches published version
发表信息：
Phys.Rev.D80:054004,2009
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摘要：

我们调查的charmonia在热介质中的属性，表明随着温度的增加，这些介子的衰变宽度表现在一个非平凡的方式。我们的分析是基于一个势模型，其中的相互作用势是从静态夸克-反夸克对自由能的热格点量子色动力学计算中提取的。我们发现，在交叉区的一些衰变宽度是非常增强，这可能被解释为从强子物质的退禁闭相的过渡的签名。特别地，在温度$T\sim T_c$下，取决于原点处的波函数的值的$J/Ψ$的衰减宽度相对于真空中的值被增强约2倍。在相同的温度范围内，过程$χ_{c J} \to J/Ψ+ γ$的衰减宽度相对于真空中的值增加约6倍。在较高的温度下，charmonia状态解离和两个衰变过程的宽度变得消失小。

英文摘要：

We investigate the properties of charmonia in a thermal medium, showing that with increasing temperature the decay widths of these mesons behave in a non-trivial way. Our analysis is based on a potential model with interaction potential extracted from thermal lattice QCD calculations of the free-energy of a static quark-antiquark pair. We find that in the crossover region some decay widths are extremely enhanced, which might be interpreted as a signature of the transition from hadronic matter to the deconfined phase. In particular, at temperatures $T\sim T_c$ the decay widths of the $J/Ψ$ that depend on the value of the wave function at the origin are enhanced with respect to the values in vacuum by about a factor 2. In the same temperature range the decay width of the process $χ_{c J} \to J/Ψ+ γ$ is enhanced by approximately a factor 6 with respect to the value in vacuum. At higher temperatures the charmonia states dissociate and the widths of both decay processes become vanishing small.

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