有限温度下的 CP 违约

Károly Seller, Zsolt Szép, Zoltán Trócsányi
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引用次数: 0

摘要

我们介绍了对源自马约拉纳费米子衰变成轻子和标量粒子的轻子发生的半经典处理中所需的有限温度CP不对称因子的全面研究。我们使用热量子场论的实时间和虚时间形式来评估相关一环积分的虚部。在前者中,我们考虑了延迟-高级方法以及由 Kobes 和 Semenoff 发展的原始热切割方法。我们特别注意显示各种方法之间的一致性。我们证明,计算的最终物理结果与统计因子呈线性关系,并且与卡达诺夫-贝姆方法的结果一致。我们还提出了完整 CP 不对称因子的解析表达式,其形式为完备的三重积分,并提供了特定粒子物理模型中的数值基准预测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
CP violation at finite temperature
We present a comprehensive study of the finite temperature CP-asymmetry factor needed in the semi-classical treatment of leptogenesis originating from Majorana fermion decays into a lepton and a scalar particle. The imaginary part of the relevant one-loop integrals are evaluated using both the real time and the imaginary time formalisms of thermal quantum field theory. In the former we consider the retarded-advanced approach as well as the original thermal cutting method developed by Kobes and Semenoff. Specific care is directed towards showing the consistency between the various approaches. We show that the final physical result of the calculation is linear in the statistical factors and is consistent with what is obtained in the Kadanoff-Baym approach. We also present analytic expressions for the full CP-asymmetry factor in the form of well-behaved triple-integrals, and provide numerical benchmark predictions in a specific particle physics model.
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