# A Virtual Tribute to Quark Confinement and the Hadron Spectrum 2021

Aug 2 – 6, 2021
online
Europe/Brussels timezone

## $|V_{ub}|$ and $|V_{cb}|$ determinations in the presence of New Physics effects.

Aug 6, 2021, 2:55 PM
25m
online

#### online

Parallel contribution E: QCD and New Physics

### Speaker

Gilberto Tetlalmatzi-Xolocotzi (Siegen University)

### Description

Motivated by the experimental patterns of lepton-universality breaking, we present a simple strategy based on ratios of leptonic and semileptonic B decays which decouple the CKM elements $|V_{ub}|$ and $|V_{cb}|$ from the short-distance coefficients of (pseudo)-scalar, vector and tensor operator contributions associated with $b \rightarrow u$ and $b \rightarrow c$ transitions. We illustrate our strategy with different hypothetical model-independent scenarios and propose ratios for observables related with the $b \rightarrow u$ transitions with the aim of further constrain the possible new physics contributions. Moreover our results derived when studying the $b \rightarrow c$ processes lead to predictions for yet unmeasured $B_{c}$ leptonic decays. In all the cases we asses the values of $|V_{ub}|$ and $|V_{cb}|$ as well.