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arXiv 1010.2209hep-ph
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轻子成因中规范玻色子散射的CP破坏

CP Violation from Scatterings with Gauge Bosons in Leptogenesis

Chee Sheng Fong, M. C. Gonzalez-Garcia, J. Racker

摘要:

本文给出了I型跷跷板框架下重右手中微子与标准模型规范玻色子散射过程CP不对称性的显式计算。与二体衰变和顶夸克散射中的CP破坏相比,在一个圈上有新的贡献,表现为新型的顶点修正和箱形图。我们表明,它们的存在意味着,与CP不对称的散射与顶夸克,CP不对称的散射与规范玻色子是不同的两体衰变不对称,即使是层次右手中微子。这也适用于U(1)$_Y$规范玻色子散射中的L守恒CP不对称性。

英文摘要:

We present an explicit computation of the CP asymmetry in scattering processes involving the heavy right-handed neutrinos of the type I seesaw framework and the Standard Model gauge bosons. Compared to CP violation in two--body decays and in scatterings with top quarks there are new contributions at one loop in the form of new type of vertex corrections as well as of box diagrams. We show that their presence implies that, unlike the CP asymmetry in scatterings with top quarks, the CP asymmetry in scatterings with gauge bosons is different from the two-body decay asymmetry even for hierarchical right-handed neutrinos. This also holds for the L-conserving CP asymmetry in scatterings with U(1)$_Y$ gauge bosons.

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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