Revisiting Lepton Flavor Universality in B Decays

被引：143

作者：

Feruglio, Ferruccio ^{[1
,2
]}

Paradisi, Paride ^{[1
,2
]}

Pattori, Andrea ^{[1
,3
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron G Galilei, I-35100 Padua, Italy

[2] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[3] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 01期

基金：

瑞士国家科学基金会; 欧盟地平线“2020”;

关键词：

R-K; VIOLATION;

D O I：

10.1103/PhysRevLett.118.011801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Lepton flavor universality (LFU) in B decays is revisited by considering a class of semileptonic operators defined at a scale. above the electroweak scale v. The importance of quantum effects, so far neglected in the literature, is emphasized. We construct the low-energy effective Lagrangian taking into account the running effects from. down to v through the one-loop renormalization group equations (RGEs) in the limit of exact electroweak symmetry and QED RGEs from v down to the 1 GeV scale. The most important quantum effects turn out to be the modification of the leptonic couplings of the vector boson Z and the generation of a purely leptonic effective Lagrangian. Large LFU breaking effects in Z and tau decays and visible lepton flavor violating effects in the processes tau -> mu ll, tau ->mu rho , tau -> mu pi, and tau -> mu eta((')) are induced.

引用

页数：5

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