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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Infrared behaviour of high-temperature quantum chromodynamics (QCD)
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Infrared behaviour of high-temperature quantum chromodynamics (QCD)

机译:高温量子色动力学(QCD)的红外行为

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摘要

The damping rate gamma(t) ( p) of on-shell transverse gluons with ultrasoft momentum p is obtained in the context of next-to-leading-order hard-thermal-loop-summed perturbation of high-temperature massless quantum chromodynamics (QCD). It is obtained in an expansion to the second order in p. The first coefficient known in the literature is recovered, but that of order p(2) is found to be divergent in the infrared. Divergences from light-like momenta do also occur but are circumvented. By carrying out similar calculations in the context of scalar quantum electrodynamics, it is shown that early and late external-momentum expansions yield identical results.
机译:具有超软动量p的壳上横向胶子的阻尼率gamma(t)(p)是在高温无质量量子色动力学(QCD)的次先导硬热环路总扰动的背景下获得的)。它是按p的二阶展开式获得的。恢复了文献中已知的第一个系数,但是发现p(2)阶的系数在红外光中发散了。确实也出现了与类似光的动量的发散​​,但这种发散是可以避免的。通过在标量量子电动力学的背景下进行类似的计算,表明早期和晚期外部动量扩展产生相同的结果。

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