# EPS-HEP2019

Jul 10 – 17, 2019
Ghent
Europe/Brussels timezone

## Study of $B\to D^{(*)} l \nu$ decays with a full angular analysis at $BABAR$

Jul 12, 2019, 10:15 AM
20m
Campus Ledeganck - Aud. 5 (Ghent)

### Campus Ledeganck - Aud. 5

#### Ghent

Parallel talk Flavour Physics and CP Violation

### Speaker

Biplab Dey (CCNU)

### Description

We present results on the first full 4-dimensional angular analysis of $B\to D^{(*)} l \nu$, using the $e^+e^-$ collision dataset collected by the $BABAR$ experiment at the $\Upsilon(4S)$ resonance. One $B$ meson from the $\Upsilon(4S)\to B\bar{B}$ decay is fully reconstructed in a hadronic decay mode which constrains the kinematics and provides a precise determination of the neutrino momentum vector. We extract the underlying hadronic form-factors employing the model-independent BGL approach and a value for the $CKM$ matrix element $|V_{cb}|$. Last, employing our measured BGL form-factors, we provide new predictions within the Standard Model, for observables related to the the semi-tauonic decay $B\to D^{(*)} \tau \nu$.

### Primary authors

Fabio Anulli (Sapienza Universita e INFN, Roma I (IT)) Biplab Dey (CCNU)