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

Jul 24 – 30, 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

Jul 27, 2016, 9:20 AM
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