PoS - Proceedings of Science
Volume 430 - The 39th International Symposium on Lattice Field Theory (LATTICE2022) - Weak Decays and Matrix Elements
B-meson semileptonic decays with highly improved staggered quarks
A. Lytle*, C. DeTar, A.X. El-Khadra, E. Gámiz, S. Gottlieb, W. Jay, A. Kronfeld, J.N. Simone, A. Vaquero  on behalf of Fermilab Lattice and MILC Collaborations
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Pre-published on: March 27, 2023
Published on: April 06, 2023
We present an update of the Fermilab Lattice and MILC Collaborations project to compute the
form factors for semileptonic $B_{(s)}$-meson decays.
Our calculation uses the highly improved staggered quark (HISQ) action for sea and valence quarks, and ensembles with up, down, strange, and charm quarks in the sea.
Using a highly improved action with the MILC Collaboration's gauge ensembles with lattice spacings down to $a\approx0.03$ fm, allows the heavy valence quarks to be treated with the same discretization as the light and strange quarks.
This unified treatment of the valence quarks allows for absolutely normalized vector currents, bypassing the need for perturbative matching, which has been a source of uncertainty in previous calculations of $B$-meson decay form factors by our collaboration.
All preliminary form-factor results are blinded.
DOI: https://doi.org/10.22323/1.430.0418
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