Main Image
Volume 291 - 9th International Workshop on the CKM Unitarity Triangle (CKM2016) - WG3 Parallel
Theory of lepton universality, flavour and number violation
P. Paradisi
Full text: pdf
Pre-published on: 2017-06-05 16:37:27
Published on: 2017-06-13 17:09:14
Abstract
Lepton flavour universality (LFU) in B-decays is revisited by considering a class of semileptonic operators defined at a scale
Lambda above the electroweak scale v. The importance of quantum effects is emphasised ref.[1]. We construct the low-energy effective Lagrangian taking into account the running effects from Lambda 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 tau decays as well as visible lepton flavour violating (LFV)
effects in tau decays are induced.
Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.