Viscosity and dilepton production of a chemically equilibrating quark-gluon plasma at finite baryon density
Viscosity and dilepton production of a chemically equilibrating quark-gluon plasma at finite baryon density
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有限重子密度下化学平衡夸克-胶子等离子体的粘度和双轻子产生
DOI：
10.1103/physrevc.80.014908
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发表时间：
2009-07
影响因子：
3.1
通讯作者：
中科院分区：
文献类型：
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作者：
考虑剪切粘滞效应，我们研究了有限重子密度下化学平衡夸克胶子等离子体的演化。在此基础上，我们对双轻子的产生过程进行了完整的计算：qq -> l1 q，qq -> gll，类康普顿散射（qg -> qll，qg -> qll），胶子熔合（gg -> cc），湮灭（qq -> cc），以及夸克的多次散射。我们发现夸克-反夸克湮灭、类康普顿散射、胶子融合和夸克的多重散射都有重要贡献。此外，我们还发现双轻子产额是初始夸克化学势的增函数，并且由于粘滞性而增加的夸克相寿命也明显地提高了双轻子产额。
By considering the effect of shear viscosity we have investigated the evolution of a chemically equilibrating quark-gluon plasma at finite baryon density. Based on the evolution of the system we have performed a complete calculation for the dilepton production from the following processes: qq -> l1q, qq -> gll, Compton-like scattering (qg -> qll,qg -> qll), gluon fusion (gg -> cc), annihilation (qq -> cc), as well as the multiple scattering of quarks. We have found that quark-antiquark annihilation, Compton-like scatterring, gluon fusion, and multiple scattering of quarks give important contributions. Moreover, we have also found that the dilepton yield is an increasing function of the initial quark chemical potential, and the increase of the quark phase lifetime because of the viscosity also obviously raises the dilepton yield.