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arXiv 0901.0008hep-ph
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论Gaugino对软轻子生成的贡献

On Gaugino Contributions to Soft Leptogenesis

Chee Sheng Fong, M. C. Gonzalez-Garcia

摘要:

我们研究了软超导破缺的高真质量引起的右旋超中微子衰变对CP破坏的贡献,包括味效应,并特别注意热修正的作用.使用场理论以及量子力学的方法,我们计算的CP不对称性,我们的结论是,对于所有的软超对称破缺源的CP破坏考虑,一个确切的取消之间产生的不对称性的费米和玻色子通道发生在T=0到第二阶软超对称破缺参数。一旦热效应被包括在内,由超光速破坏的高吉诺质量引起的CP破坏的新来源可以是相当大的,它们可以产生所观察到的重子不对称性的常规值的B参数。

英文摘要:

We study the contributions to CP violation in right-handed sneutrino decays induced by soft supersymmetry-breaking gaugino masses including flavour effects and paying special attention to the role of thermal corrections. Using a field-theoretical as well as a quantum mechanical approach we compute the CP asymmetries and we conclude that for all the soft-supersymmetry breaking sources of CP violation considered, an exact cancellation between the asymmetries produced in the fermionic and bosonic channels occurs at T=0 up to second order in soft supersymmetry-breaking parameters. Once thermal effects are included the new sources of CP violation induced by supersymmetry-breaking gaugino masses can be sizeable and they can produce the observed baryon asymmetry for conventional values of the B parameter.

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