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arXiv 0704.3770hep-ph
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夸克-胶子等离子体中夸克偶素的宽度

The widths of quarkonia in quark gluon plasma

Yongjae Park, Kyung-Il Kim, Taesoo Song, Su Houng Lee, Cheuk-Yin Wong

摘要:

最近的晶格计算表明,夸克偶素将在相变温度之后存活,并将根据夸克偶素的类型在不同的温度下溶解。在这项工作中,我们计算了夸克偶素在有限温度下溶解成开重夸克之前的热宽度。计算的输入是QCD中部分子夸克偶素离解到非线性光学的截面、格点量子色动力学中依赖于温度的势中的夸克偶素波函数以及具有热质量的部分子的热分布。我们发现,对于J/psi,总的热宽度超过1.4 Tc变得大于100至250 MeV,这取决于夸克和胶子的有效热质量,我们采取400至600 MeV之间。这样的宽度对应于1.4 Tc时胶子在1.5 ~ 3.5 mb和夸克在1 ~ 2 mb的有效离解截面。然而,在相似的温度下,我们发现一个小得多的热宽度和有效的截面的上升。

英文摘要:

Recent lattice calculations showed that the quarkonia will survive beyond the phase transition temperature, and will dissolve at different temperatures depending on the type of the quarkonium. In this work, we calculate the thermal width of the quarkonium at finite temperature before it dissolves into open heavy quarks. The input of the calculation are the parton quarkonium dissociation cross section to NLO in QCD, the quarkonium wave function in a temperature-dependent potential from lattice QCD, and a thermal distribution of partons with thermal masses. We find that for the J/psi, the total thermal width above 1.4 Tc becomes larger than 100 to 250 MeV, depending on the effective thermal masses of the quark and gluon, which we take between 400 to 600 MeV. Such a width corresponds to an effective dissociation cross section by gluons between 1.5 to 3.5 mb and by quarks 1 to 2 mb at 1.4 Tc. However, at similar temperatures, we find a much smaller thermal width and effective cross section for the upsilon.

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