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Theory Status - Puzzles in B Meson Decays and LFU?

by Svjetlana Fajfer

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Submission summary

Authors (as registered SciPost users): Svjetlana Fajfer
Submission information
Preprint Link: scipost_201811_00018v1  (pdf)
Date accepted: 2019-01-15
Date submitted: 2018-11-14 01:00
Submitted by: Fajfer, Svjetlana
Submitted to: SciPost Physics Proceedings
Proceedings issue: The 15th International Workshop on Tau Lepton Physics (TAU2018)
Ontological classification
Academic field: Physics
  • Quantum Physics
Approach: Theoretical


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.

Published as SciPost Phys. Proc. 1, 010 (2019)

Reports on this Submission

Anonymous Report 1 on 2018-11-26 (Contributed 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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