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arXiv 1608.01979hep-ph
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有限温度下重Majorana中微子衰变中的CP不对称性:分级情形

CP asymmetry in heavy Majorana neutrino decays at finite temperature: the hierarchical case

Simone Biondini, Nora Brambilla, Antonio Vairo

摘要:

我们认为最简单的实现leptogenesis与一个重马约拉纳中微子物种比其他轻得多。在这种情况下,当早期宇宙的温度小于最轻的马约拉纳中微子的质量,我们计算在一阶的标准模型耦合,并为每个耦合,在温度的领先顺序的CP不对称性的最轻的中微子衰变成轻子和反轻子。我们使用两个有效场论的层次结构进行计算,这些场论被组织为重中微子质量的逆的展开。在终极有效场论中,与希格斯自耦合和规范耦合成比例的主要热校正被编码在一个单一的五维算子中,而与汤川耦合成比例的校正被编码在四个七维算子中,我们计算。

英文摘要:

We consider the simplest realization of leptogenesis with one heavy Majorana neutrino species much lighter than the other ones. In this scenario, when the temperature of the early universe is smaller than the lightest Majorana neutrino mass, we compute at first order in the Standard Model couplings and, for each coupling, at leading order in the termperature the CP asymmetry in the decays of the lightest neutrino into leptons and anti-leptons. We perform the calculation using a hierarchy of two effective field theories organized as expansions in the inverse of the heavy-neutrino masses. In the ultimate effective field theory, leading thermal corrections proportional to the Higgs self coupling and the gauge couplings are encoded in one single operator of dimension five, whereas corrections proportional to the top Yukawa coupling are encoded in four operators of dimension seven, which we compute.

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