Speaker
Nicholas Cassar
(Colorado State University)
Description
We present an update on our calculation of form factors for the decay $B\to \pi \ell \nu$ from lattice QCD using Highly Improved Staggered Quarks. The calculation is performed using the MILC collaboration's $n_f = 2+1+1$ HISQ gauge-field ensembles with the same HISQ action used for both the valence and sea quarks. We use nine ensembles with lattice spacings ranging from 0.09 fm down to 0.03 fm. Three ensembles have physical mass pions, and on the three finest ensembles we compute form factors at the physical bottom quark mass. In this talk, we present preliminary, blinded results of our form factors in the continuum limit at the physical point.
Authors
Nicholas Cassar
(Colorado State University)
Akhil Chauhan
(University of Illinois Urbana Champaign)
CARLETON DETAR
(University of Utah)
William Jay
(Colorado State University)
Alejandro Vaquero Avilés-Casco
(University of Zaragoza)
Andreas Kronfeld
(Fermi National Accelerator Lab. (US))
Steven Gottlieb
(Indiana University)
Aida El-Khadra
(University of Illinois Urbana-Champaign)
Elvira Gamiz
(University of Granada)
Andrew Lytle
John Laiho
(Syracuse University)