Speaker
Mr
Zechariah Gelzer
(University of Iowa)
Description
We report the status of an ongoing lattice-QCD calculation of form factors
for exclusive semileptonic decays of $B$~mesons with both charged currents
($B\to\pi\ell\nu$, $B_s\to K\ell\nu$) and neutral currents
($B\to\pi\ell^+\ell^-$, $B\to K\ell^+\ell^-$). The results are important for
constraining or revealing physics beyond the Standard Model. This work uses
MILC's (2+1+1)-flavor ensembles with the HISQ action for the sea and light
valence quarks and the clover action in the Fermilab interpretation for the
$b$~quark. Simulations are carried out at three lattice spacings down to
$0.088$~fm, with both physical and unphysical sea-quark masses. We present
preliminary blinded results for the form factors $f_+(q^2)$, $f_0(q^2)$, and
$f_T(q^2)$ (in terms of momentum transfer $q^2$), along with an examination of
systematic errors. Our preliminary results include studies of $z$-expansion
methods to extend the kinematic range.
Primary author
Mr
Zechariah Gelzer
(University of Iowa)
Co-authors
Prof.
Aida El-Khadra
(University of Illinois at Urbana-Champaign)
Dr
Andreas Kronfeld
(Fermilab)
Carleton DeTar
(University of Utah)
Prof.
Claude Bernard
(Washington University)
Dr
Elvira Gamiz
(University of Granada)
Dr
James Simone
(Fermilab)
Dr
Ruth Van de Water
(Fermilab)
Steven Gottlieb
(Indiana Univ.)
Yannick Meurice
(U. of Iowa)
Yuzhi Liu