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arXiv 0903.1776hep-ph
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用μ-> e γ探测超对称轻子成因

Probing Supersymmetric Leptogenesis with mu --> e gamma

Alejandro Ibarra, Cristoforo Simonetto

摘要:

用三个右手中微子超场扩展最小超对称标准模型是物理学超越标准模型的最佳动机之一。然而,很少有人知道从观察这个模型的高能量参数。在本文中,我们表明,在合理的假设下,中微子Yukawa本征值是分层的和取消的情况下,存在一个上限的最小Yukawa本征值源于罕见的轻子衰变μ-> e γ的非观测。此外,我们还指出,对于典型的超对称参数,这一界限意味着最轻右手中微子质量的上限约为5 × 10^12 GeV。我们还讨论了最轻的右手中微子的衰变的基础上的最小leptogenesis方案的上限的影响,我们认为,六个数量级的灵敏度的改进的过程μ-> e γ可以排除这种机制作为观察到的重子不对称性的起源,除非中微子参数采取非常具体的值。

英文摘要:

Extending the Minimal Supersymmetric Standard Model with three right-handed neutrino superfields is one of the best motivated scenarios for physics beyond the Standard Model. However, very little is known from observations about the high energy parameters of this model. In this paper we show, under the plausible assumptions that the neutrino Yukawa eigenvalues are hierarchical and the absence of cancellations, that there exists an upper bound on the smallest Yukawa eigenvalue stemming from the non-observation of the rare lepton decay mu --> e gamma. Furthermore, we show that this bound implies an upper bound on the lightest right-handed neutrino mass of approximately 5x10^12 GeV for typical supersymmetric parameters. We also discuss the implications of this upper bound for the minimal leptogenesis scenario based on the decay of the lightest right-handed neutrino and we argue that an improvement of sensitivity of six orders of magnitude to the process mu --> e gamma could rule out this mechanism as the origin of the observed baryon asymmetry, unless the neutrino parameters take very specific values.

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