B-physics anomalies: a guide to combined explanations

Author:

Buttazzo Dario,Greljo Admir,Isidori Gino,Marzocca David

Abstract

Abstract Motivated by additional experimental hints of Lepton Flavour Universality violation in B decays, both in charged- and in neutral-current processes, we analyse the ingredients necessary to provide a combined description of these phenomena. By means of an Effective Field Theory (EFT) approach, based on the hypothesis of New Physics coupled predominantly to the third generation of left-handed quarks and leptons, we show how this is possible. We demonstrate, in particular, how to solve the problems posed by electroweak precision tests and direct searches with a rather natural choice of model parameters, within the context of a U(2) q ×U(2) flavour symmetry. We further exemplify the general EFT findings by means of simplified models with explicit mediators in the TeV range: coloured scalar or vector leptoquarks and colour-less vectors. Among these, the case of an SU(2) L -singlet vector leptoquark emerges as a particularly simple and successful framework.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

Reference78 articles.

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4. Belle collaboration, S. Hirose et al., Measurement of the τ lepton polarization and R(D ∗) in the decay $$ \overline{B}\to {D}^{\ast }{\tau}^{-}{\overline{\nu}}_{\tau } $$, Phys. Rev. Lett. 118 (2017) 211801 [arXiv:1612.00529] [INSPIRE].

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