Speaker
Dr
Matthew Wingate
(DAMTP, University of Cambridge)
Description
This poster reviews our recent calculation of $B \to K^*$, $B_s \to \phi$, and
$B_s \to K^*$ form factors using nonrelativistic heavy quarks and improved
staggered quarks on MILC lattices. These unquenched calculations, performed
in the low-recoil kinematic regime, provide a significant improvement over the
use of extrapolated light cone sum rule results. We use the form factors
along with Standard Model determinations of Wilson coefficients to give
theoretical results for several observables. Noting that the experimental
measurements for the $B^0 \to K^{*0} \mu^+ \mu^-$ and $B_s \to \phi \mu^+
\mu^-$ branching fractions are smaller at low-recoil than the Standard Model
predictions, we perform a fit of the relevant Wilson coefficients using
experimental and lattice results. The favored values hint at deviations from
the Standard Model that are consistent with fits done by other authors using
complementary theoretical and experimental inputs.
Primary author
Dr
Matthew Wingate
(DAMTP, University of Cambridge)
Co-authors
Prof.
Ronald Horgan
(DAMTP, University of Cambridge)
Dr
Stefan Meinel
(Massachusetts Institute of Technology)
Zhaofeng Liu
(Institute of High Energy Physics)
