PoS - Proceedings of Science
Volume 363 - 37th International Symposium on Lattice Field Theory (LATTICE2019) - Main session
B-meson semileptonic form factors on (2+1+1)-flavor HISQ ensembles
Z. Gelzer*, C. DeTar, A.X. El-Khadra, E. Gámiz, S. Gottlieb, A. Kronfeld, Y. Liu, Y. Meurice, J.N. Simone, D. Toussaint, R.S. Van deWater  on behalf of Fermilab Lattice and MILC Collaborations
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Pre-published on: January 04, 2020
Published on: August 27, 2020
We report updates to an ongoing lattice-QCD calculation of the form factors for the semileptonic decays $B \to \pi \ell \nu$, $B_s \to K \ell \nu$, $B \to \pi \ell^+ \ell^-$, and $B \to K \ell^+ \ell^-$.
The tree-level decays $B_{(s)} \to \pi (K) \ell \nu$ enable precise determinations of the CKM matrix element $|V_{ub}|$, while the flavor-changing neutral-current interactions $B \to \pi (K) \ell^+ \ell^-$ are sensitive to contributions from new physics.
This work uses MILC's (2+1+1)-flavor HISQ ensembles at approximate lattice spacings between $0.057$ and $0.15$ fm, with physical sea-quark masses on four out of the seven ensembles.
The valence sector is comprised of a clover $b$ quark (in the Fermilab interpretation) and HISQ light and $s$ quarks.
We present preliminary results for the form factors $f_0$, $f_+$, and $f_T$, including studies of systematic errors.
DOI: https://doi.org/10.22323/1.363.0236
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