Semileptonic B-meson decays to light pseudoscalar mesons on the HISQ ensembles

¹ Department of Physics, University of Illinois, Urbana, IL 61801, USA
² Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USA
³ Department of Physics, Washington University, St. Louis, Missouri, 63130, USA
⁴ Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
⁵ Fermi National Accelerator Laboratory, Batavia, Illinois, USA
⁶ CAFPE and Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada, Spain
⁷ Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
⁸ Institute for Advanced Study, Technische Universität München, D-85748 Garching, Germany
⁹ Department of Physics, University of Arizona, Tucson, Arizona 85721, USA

^* e-mail: zgelzer@illinois.edu
^** Speaker, e-mail: ask@fnal.gov

Published online: 26 March 2018

Abstract

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 → πlv, Bs → Klv) and neutral currents (B → πl⁺l^-, B → Kl⁺l^-). 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 results for correlation-function fits.