B-meson semileptonic form factors on (2+1+1)-flavor HISQ ensembles

Z. Gelzer; C. DeTar; A. X. El-Khadra; E. Gámiz; Steven Gottlieb; Andreas S. Kronfeld; Yuzhi Liu; Y. Meurice; J. N. Simone; D. Toussaint; R. S. Van de Water

doi:10.48550/arXiv.1912.13358

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B-meson semileptonic form factors on (2+1+1)-flavor HISQ ensembles

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B-meson semileptonic form factors on (2+1+1)-flavor HISQ ensembles

Z. Gelzer, C. DeTar, A. X. El-Khadra, E. Gámiz, Steven Gottlieb, Andreas S. Kronfeld, Yuzhi Liu, Y. Meurice, J. N. Simone, D. Toussaint, …

ArXiv.org

12/31/2019

DOI: 10.48550/arXiv.1912.13358

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Preprint (Author's original)This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

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.

PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Details

Title: Subtitle: B-meson semileptonic form factors on (2+1+1)-flavor HISQ ensembles
Creators: Z. Gelzer - Illinois U., Urbana] (ORCID:0000000235174655
C. DeTar - Utah U
A. X. El-Khadra - Fermi National Accelerator Laboratory
E. Gámiz - CAFPE, Granada
Steven Gottlieb - Indiana U
Andreas S. Kronfeld - First Technical University
Yuzhi Liu - Indiana U
Y. Meurice - Iowa U
J. N. Simone - Fermi National Accelerator Laboratory
D. Toussaint - Arizona U
R. S. Van de Water - Fermi National Accelerator Laboratory
Resource Type: Preprint
Publication Details: ArXiv.org
DOI: 10.48550/arXiv.1912.13358
ISSN: 2331-8422
Language: English
Date posted: 12/31/2019
Academic Unit: Physics and Astronomy
Record Identifier: 9984429050502771

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