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arXiv 1708.07802hep-ph
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$τ^- \to η^{(\prime)} π^- ν_τ$衰变的有效场论分析

Effective-field theory analysis of the $τ^- \to η^{(\prime)} π^- ν_τ$ decays

E. A. Garcés, M. Hernández Villanueva, G. López Castro, P. Roig

摘要:

在标准模型中,被$G$ -宇称抑制的罕见的$τ^- \to η^{(\prime)} π^- ν_τ$衰变对新相互作用的影响是敏感的。我们研究的灵敏度不同的观测这些衰变的有效场论,其中包括最一般的SM字段之间的相互作用,以6维的框架,假设无质量的中微子。由于SM的同位旋破缺振幅的强抑制,我们发现,不同的可观测量将允许设置比来自其他低能可观测量的标量相互作用更强的约束。

英文摘要:

The rare $τ^- \to η^{(\prime)} π^- ν_τ$ decays, which are suppressed by $G$-parity in the Standard Model (SM), can be sensitive to the effects of new interactions. We study the sensitivity of different observables of these decays in the framework of an effective field theory that includes the most general interactions between SM fields up to dimension six, assuming massless neutrinos. Owing to the strong suppression of the SM isospin breaking amplitudes, we find that the different observables would allow to set constraints on scalar interactions that are stronger than those coming from other low-energy observables.

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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