# 30th International Symposium on Lepton Photon Interactions at High Energies

Jan 10 – 14, 2022
Online only
Europe/London timezone

## On the significance of the flavour anomalies

Jan 10, 2022, 4:21 PM
1m
Online only

Poster Flavour

### Speaker

Davide Lancierini (University of Zurich (CH))

### Description

A coherent pattern of deviations from Standard Model predictions has been observed in $b$-hadron decays of the type $b\to s\ell^+\ell^-$. These deviations seem to indicate
the existence of a new fundamental interaction that breaks lepton flavour universality (LFU).
We discuss the Look Elsewhere Effect in estimating the significance
of this hypothesis and, more generally, any new physics of short-distance origin
in this system, by combining different observables.
We show that even using a very conservative approach towards theory uncertainties, and very general new-physics hypotheses, a significance of about 4 sigma is obtained.
In view of future experimental tests of LFU in these channels, we present a general expression that allows one to include in the fit of modified Wilson coefficients also observables such as $R_{pK}$, $R_{K\pi}$ and $R_{K\pi\pi}$, for which the form factors are unknown. We show that the inclusion of such observables can have a dramatic effect on the new physics significance.

### Primary authors

Abhijit Mathad (Universitaet Zuerich (CH)) Nicola Serra (Universitaet Zuerich (CH)) Gino Isidori (Universitaet Zuerich (CH)) Patrick Haworth Owen (Universitaet Zuerich (CH)) Rafael Silva Coutinho (Universitaet Zuerich (CH))

### Presentation materials

 LP2021_poster_lancierini.pdf zoom room