July 31, 2017 to August 4, 2017
Fermi National Accelerator Laboratory
US/Central timezone

Semileptonic B-meson decays to light pseudoscalar mesons with lattice QCD

Aug 3, 2017, 11:21 AM
18m
Curia II (Fermi National Accelerator Laboratory)

Curia II

Fermi National Accelerator Laboratory

Presentation Quark and Lepton Flavor Quark and Lepton Flavor

Speaker

Mr Zechariah Gelzer (University of Iowa)

Description

We present 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 four lattice spacings down to 0.088 fm, with both physical and a few nonphysical sea-quark masses. We present preliminary results for correlation-function fits and the chiral-continuum extrapolation of the form factors.

Primary author

Mr Zechariah Gelzer (University of Iowa)

Co-authors

Dr Andreas Kronfeld (Fermilab) Yannick Meurice (U. of Iowa)

Presentation materials