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

Judd Harrison; Christine Davies; Matthew Wingate

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

High Energy Physics - Lattice 2017-01-11 v2

Authors: Judd Harrison , Christine Davies , Matthew Wingate

Abstract

We present the status of our ongoing calculation of the zero-recoil form factor for the semileptonic decay $\bar{B}^0\rightarrow D^{*+}l^-\bar{\nu}$ 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 combine our result for $F(1)$ with the latest HFAG average of $\eta_{EW} F(1)|V_{cb}|$ to get a preliminary value for $|V_{cb}|$ .

Keywords

semileptonic decay zero-recoil form factor lattice QCD HISQ NRQCD CKM matrix Vcb

Cite

@article{arxiv.1612.06716,
  title  = {$|V_{cb}|$ from the $\bar{B}^0 \to D^{*+} \ell^- \bar{\nu}$ zero-recoil form factor using $2+1+1$ flavour HISQ and NRQCD},
  author = {Judd Harrison and Christine Davies and Matthew Wingate},
  journal= {arXiv preprint arXiv:1612.06716},
  year   = {2017}
}

Comments

Contribution to the Proceedings of the 34th annual International Symposium on Lattice Field Theory, 24-30 July 2016, University of Southampton, UK. 6 pages, 1 figure

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