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arXiv 1111.0117hep-ph
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强耦合QCD/QED介质中的消失热质量

Vanishing Thermal Mass in the Strongly Coupled QCD/QED medium

Hisao Nakkagawa, Hiroshi Yokota, Koji Yoshida

摘要:

本文利用改进阶梯核的Dyson-Schwinger方程,对热QCD/QED中的热准费米子的自能函数进行了非微扰分析。我们的分析揭示了几个有趣的结果,其中一些可能迫使我们改变热准费米子的形象:(1)准费米子的热质量随着耦合的加强而开始减少,并最终在强耦合区消失,(2)手征不变质量函数的虚部(即,准费米子的衰变宽度)持续具有$O(g^2 T \log (1/g))$行为。目前的结果表明,在最近产生的强耦合夸克胶子等离子体,准费米子的热质量应该消失。我们还简要地评论存在的无质量,或超软模式的证据。

英文摘要:

In this paper we perform a nonperturbative analysis of a thermal quasifermion in thermal QCD/QED by studying its self-energy function through the Dyson-Schwinger equation with the hard-thermal-loop resummed improved ladder kernel. Our analysis reveals several interesting results, some of which may force us to change the image of the thermal quasifermion: (1) The thermal mass of a quasifermion begins to decrease as the coupling gets stronger and finally disappears in the strong coupling region,(2) the imaginary part of the chiral invariant mass function (i.e., the decay width of the quasifermion) persists to have $O(g^2 T \log (1/g))$ behavior. Present results suggest that in the recently produced strongly coupled quark-gluon-plasma, the thermal mass of a quasifermion should vanish. We also briefly comment on evidence of the existence of a massless, or an ultrasoft mode.

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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