July 28, 2020 to August 6, 2020
virtual conference
Europe/Prague timezone

A combined explanation of the $B$-decay anomalies with a single vector leptoquark

Jul 31, 2020, 1:48 PM
virtual conference

virtual conference

Poster 03. Beyond the Standard Model Beyond the Standard Model - Posters


Jonathan Kriewald (LPC Clermont)


In order to simultaneously account for both $R_{D^{(\ast)}}$ and
$R_{K^{(\ast)}}$ anomalies in $B$-decays, we consider an extension
of the Standard Model by a single vector leptoquark field, and study
how one can achieve the required lepton flavour non-universality,
starting from a priori universal gauge couplings. While the unitary
quark-lepton mixing induced by $SU(2)_L$ breaking is insufficient,
we find that effectively nonunitary mixings hold the key to
simultaneously address the $R_{K^{(\ast)}}$ and $R_{D^{(\ast)}}$
anomalies. As an intermediate step towards various UV-complete
models, we show that the mixings of charged leptons with additional
vector-like heavy leptons successfully provide a nonunitary
framework to explain $R_{K^{(\ast)}}$ and $R_{D^{(\ast)}}$.
These realisations have a strong impact for electroweak
precision observables and for flavour violating ones: isosinglet
heavy lepton realisations are already excluded due to excessive
contributions to lepton flavour violating $Z$-decays.
Furthermore, in the near future, the expected progress in the sensitivity
of charged lepton flavour violation experiments should allow to fully probe
this class of vector leptoquark models.

Secondary track (number) 05.

Primary author

Jonathan Kriewald (LPC Clermont)


Chandan Hati (LPC Clermont) Ana M. Teixeira (LPC Clermont) Jean Orloff (Université Blaise Pascal - Clermont-Ferrand)

Presentation materials