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2019

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

Gelzer, Z., DeTar, C., El-Khadra, A. X. et al.

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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.

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

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A. X. El-Khadra, A. S. Kronfeld, P. B. Mackenzie, S. M. Ryan and J. N. Simone, The Semileptonic decays B → π l ν B\to\pi l\nu and D → π l ν D\to\pi l\nu from lattice QCD , Phys. Rev. D64 (2001) 014502 [ hep-ph/0101023 ]
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C. Bourrely, I. Caprini and L. Lellouch, Model-independent description of B → π l ν B\to\pi l\nu decays and a determination of | V u b | |V_{ub}| , Phys. Rev. D79 (2009) 013008 [ 0807.2722 ]
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