| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5493663 | Nuclear and Particle Physics Proceedings | 2017 | 6 Pages |
Abstract
Lepton flavour universality (LFU) in B-decays is revisited by considering a class of semileptonic operators defined at a scale Î above the electroweak scale v. The importance of quantum effects is emphasised [F. Feruglio, P. Paradisi and A. Pattori, arXiv:1606.00524 [hep-ph], to appear in PRL]. We construct the low-energy effective Lagrangian taking into account the running effects from Î down to v through the one-loop renormalization group equations (RGE) 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 Ï decays as well as visible lepton flavour violating (LFV) effects in Ï decays are induced.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Paride Paradisi,