Speaker
Heechang Na
(University of Utah)
Description
We present our recent results on B to D, Bs to Ds, and Bs to K Standard Model tree level semileptonic decays.
We have used MILC Nf=2+1 asqtad gauge configurations with two lattice spacings.
For the valence quarks, we used NRQCD bottom quarks and HISQ light and charm quarks.
The B to D and Bs to Ds semileptonic form factors can be used for better determination of the Bs to [mu^+ mu^-] branching fraction.
Furthermore the ratio R(D) of the B to [D, tau, nu] and B to [D, mu, nu] branching fractions is of considerable phenomenological interest since there currently exists some tension between experiment and Standard Model predictions for R(D).
The Bs to K semileptonic decay is a new channel at LHCb and Belle II for alternate V_{ub} determinations.
Our form factor results for this decay are the first from lattice QCD.
Primary authors
Chris Bouchard
(The Ohio State University)
Heechang Na
(University of Utah)
Co-authors
Chris Monahan
(College of William and Mary)
Junko Shigemitsu
(The Ohio State University)
Peter Lepage
(Cornell University)
