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# EPS-HEP2021 conference

Jul 26 – 30, 2021
Zoom
Europe/Berlin timezone

## Updated Predictions for $R(D^{(*)})$ within and beyond the Standard Model and determination of $|V_{cb}|$

Jul 27, 2021, 10:30 AM
15m
Zoom

#### Zoom

Parallel session talk Flavour Physics and CP Violation

### Speaker

Florian Bernlochner (BELLE (BELLE II Experiment))

### Description

In Heavy Quark Effective Theory (HQET), measured $B \to D^{(*)} \ell \bar \nu_\ell$ decay rates for light leptons constrain all $B \to D^{(*)}$ semileptonic form factors, both in and beyond the Standard Model (SM). We update our prior HQET-based analysis, carrying out a global fit including newly available measurements of $B \to D^{(*)} \ell \bar \nu_\ell$ decay distributions to predict: the $B \to D^{(*)} \tau \bar \nu_\tau$ rates; the lepton universality ratios $R(D^{(*)})$ within and beyond the SM; and determine the CKM matrix element $|V_{cb}|$. The update incorporates a more systematic treatment of certain corrections at order $1 / m_{c}^2$, and discusses the impact of including preliminary lattice QCD information for $B \to D^{(*)}$ form factor ratios from JLQCD.

Collaboration / Activity University of Bonn

### Primary authors

Zoltan Ligeti (LBNL) Dean Robinson (LBNL) Michele Papucci (Caltech) Markus Prim (University of Bonn) Xiong Chenglu (University of Bonn) Florian Bernlochner (BELLE (BELLE II Experiment))