# EPS-HEP2019

Jul 10 – 17, 2019
Ghent
Europe/Brussels timezone

## The determination of |Vcb| from B->D(*)lnu

Jul 12, 2019, 12:05 PM
20m
Campus Ledeganck - Aud. 5 (Ghent)

### Campus Ledeganck - Aud. 5

#### Ghent

Parallel talk Flavour Physics and CP Violation

### Speaker

Florian Urs Bernlochner (KIT - Karlsruhe Institute of Technology (DE))

### Description

The precision determination of the CKM matrix element $|V_{cb}|$ from
semileptonic $B \to D^*$ and $B \to D$ decays provides an important input to test
the unitarity of the CKM matrix and search for new physics. In recent
analyses, higher values of $|V_{cb}|$ were extracted using (the so-called BGL)
form factor parametrization, which allows more freedom to describe the
experimental spectra. We develop a systematic approach to assess the
role of the truncation order of the form factor parametrization, and
study its impact on the extracted value of $|V_{cb}|$. In addition, we survey
the current status of $|V_{cb}|$ extractions and their compatibility with heavy
quark symmetry.

### Primary authors

Florian Urs Bernlochner (KIT - Karlsruhe Institute of Technology (DE)) Zoltan Ligeti (Lawrence Berkeley National Lab. (US)) Dean Robinson (UC Santa Cruz/ LBL)