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arXiv 1508.01705hep-ph
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具有膜定域或近膜定域Higgs粒子的RS模型中的轻子味破坏

Lepton flavour violation in RS models with a brane- or nearly brane-localized Higgs

M. Beneke, P. Moch, J. Rohrwild

摘要:

本文在全五维量子场论框架下,对Randall-Sundrum(RS)模型中的带电轻子味破坏进行了全面的研究。我们认为RS模型与最小的字段内容和“保管保护”的扩展,以及三个实现的IR膜本地化的希格斯场,包括非去耦效应的卡鲁扎-克莱因(KK)激发的一个狭窄的散装希格斯。我们的计算提供了Randall-Sundrum模型中味道破坏电磁偶极子算子的第一个完整结果。它包含三个贡献与不同的依赖于无政府的5D汤川矩阵的大小,这可能都是重要的,在某些参数区域。通过数值扫描研究了最小和保管RS模型中mu -> e γ,mu -> 3e,mu N -> e N以及tau -> mu γ,tau -> 3 mu的分支分数和电子电偶极矩的典型范围. mu -> e gamma和mu N -> e N的组合目前对模型的参数空间提供了最严格的约束。在极小模型中,KK标度T的典型下限约为2 TeV(在具有大汤川耦合的体希格斯粒子情况下可达4 TeV),在保管保护模型中约为4 TeV,这对应于第一次KK激发的质量约为10 TeV,远远超出了LHC未观测到直接产生的下限。

英文摘要:

We perform a comprehensive study of charged lepton flavour violation in Randall-Sundrum (RS) models in a fully 5D quantum-field-theoretical framework. We consider the RS model with minimal field content and a "custodially protected" extension as well as three implementations of the IR-brane localized Higgs field, including the non-decoupling effect of the Kaluza-Klein (KK) excitations of a narrow bulk Higgs. Our calculation provides the first complete result for the flavour-violating electromagnetic dipole operator in Randall-Sundrum models. It contains three contributions with different dependence on the magnitude of the anarchic 5D Yukawa matrix, which can all be important in certain parameter regions. We study the typical range for the branching fractions of mu -> e gamma, mu -> 3e, mu N -> e N as well as tau -> mu gamma, tau -> 3 mu and the electron electric dipole moment by a numerical scan in both the minimal and the custodial RS model. The combination of mu -> e gamma and mu N -> e N currently provides the most stringent constraint on the parameter space of the model. A typical lower limit on the KK scale T is around 2 TeV in the minimal model (up to 4 TeV in the bulk Higgs case with large Yukawa couplings), and around 4 TeV in the custodially protected model, which corresponds to a mass of about 10 TeV for the first KK excitations, far beyond the lower limit from the non-observation of direct production at the LHC.

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