# Theory Status - Puzzles in B Meson Decays and LFU?

### Submission summary

 As Contributors: Svjetlana Fajfer Preprint link: scipost_201811_00018v1 Date accepted: 2019-01-15 Date submitted: 2018-11-14 Submitted by: Fajfer, Svjetlana Submitted to: SciPost Physics Proceedings Proceedings issue: The 15th International Workshop on Tau Lepton Physics (Amsterdam, 2018-09) Domain(s): Theoretical Subject area: Quantum Physics

### Abstract

Currently B meson puzzles motivate many studies of New Physics due to the observed deviations from the Standard Model predictions. There are two B meson puzzles, RD(∗) and RK(∗). The first one denotes the deviations in the decays driven by the charged current in the ratio of the decay widths for B → D(∗)τν and B → D(∗)μν, while the second one is related to the ratio of the decay widths for B → K (∗) μ+ μ− and B → K (∗) e+ e− transition. Also, the measured muon anomalous magnetic moment differs from the SM predictions. Usually, the effective Lagrangian approach containing New Physics effects is used to analyse RD(∗) and RK(∗). Among many models of New Physics, various leptoquark models are suggested to resolve both B meson anomalies. If New Physics is confirmed in B decays a number of processes at low and high energies should confirm its presence.

### Submission & Refereeing History

Submission scipost_201811_00018v1 on 14 November 2018

## Reports on this Submission

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### Report

The writeup is a useful summary of the status of theoretical studies of possible signs of violations of Lepton Flavour Universality in B-meson decays and a valuable contribution to the proceedings.

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