# The 34th International Symposium on Lattice Field Theory (Lattice 2016)

24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

## $|V_{cb}|$ from $\bar{B}^0\rightarrow D^{*+} \ell^- \bar{\nu}$ zero-recoil form factor using 2$+$1$+$1 flavour HISQ and NRQCD

27 Jul 2016, 09:20
20m
Building B2a Room 2065 (Highfield Campus, University of Southampton)

### Building B2a Room 2065

#### Highfield Campus, University of Southampton

Talk Weak Decays and Matrix Elements

### Speaker

Mr Judd Harrison (Department of applied mathematics and theoretical physics, University of Cambridge)

### Description

We present our recent calculation of the zero-recoil form factor for the semileptonic decay $\bar{B}^0\rightarrow D^{*+} \ell^- \bar{\nu}$ using lattice QCD with 2+1+1 flavours of highly improved staggered quarks in the sea (the MILC HISQ configurations) and using non-relativistic QCD for the bottom quark. We obtain $\mathcal{F}(1)$ and combine this with the latest HFAG average of $\eta_{EW} \mathcal{F}(1) |V_{cb}|$ to get a value for $|V_{cb}|$.

### Primary author

Mr Judd Harrison (Department of applied mathematics and theoretical physics, University of Cambridge)

### Co-authors

Prof. Christine Davies (University of Glasgow) Dr Matthew Wingate (University of Cambridge)

 Slides