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arXiv 1202.1640hep-phhep-exhep-lat
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胶子-介子模型中π介子和K介子重离子多重数的计算

Computation of pion and kaon heavy ion multiplicities in a gluon-meson model

P. Bicudo, F. Giacosa, E. Seel

摘要:

在高能重离子碰撞中,夸克-胶子等离子体的起始是以胶子为主的有色玻璃凝聚。末态是强子态,主要是π介子和K介子。在这里,我们研究了一种有效的量子色动力学方法,它可以帮助描述胶子到轻介子的跃迁。形式上,我们的方法包括从QCD路径积分中积分出夸克场,利用辅助场。这样,费米子场就被轻介子所取代,例如π介子和σ场。我们应用我们的有效作用量来计算由玻尔兹曼胶子气体发射的每个胶子的π介子和K介子的数量,它们的多重性作为胶子质量的函数。我们的结论是有效胶子质量在T=Tc时仍然是有限的。

英文摘要:

In high energy Heavy Ion Collisions, the onset of the quark-gluon plasma is the colour glass condensate, dominated by gluons. The final state is hadronic, and dominated by pions and kaons. Here we investigate an effective approach of QCD with these bosonic fields and which can help to describe the transition of gluons into light mesons. Formally, our approach consists in integrating out the quark fields from the QCD path integral, utilizing auxiliary fields. In this way the fermionic fields are replaced by light mesons, such as the pions and sigma field. We apply our effective action to compute the number of pions and kaons per gluon emitted by a Boltzmann gluon gas, their multiplicities as function of a gluon mass. We conclude that an effective gluon mass remains finite at T=Tc.

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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