Heavy-meson semileptonic decays for the Standard Model and beyond

Yuzhi Liu , Ran Zhou , Jon A. Bailey , A. Bazavov , C. Bernard , C. M. Bouchard , C. DeTar , Daping Du

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A. X. El-Khadra J. Foley E. D. Freeland E. G\'amiz Steven Gottlieb U. M. Heller R. D. Jain Jongjeong Kim A. S. Kronfeld J. Laiho L. Levkova P. B. Mackenzie Y. Meurice D. Mohler E. T. Neil M. B. Oktay Si-Wei Qiu J. N. Simone R. Sugar D. Toussaint R. S. Van de Water

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classification ✦ hep-lat hep-ph

keywords decayslatticequarkrangesemileptonicasqtadbeyondcalculate

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We calculate the form factors for the semileptonic decays $B_s\to K\ell\nu$ and $B\to K\ell\ell$ with lattice QCD. We work at several lattice spacings and a range of light quark masses, using the MILC 2+1-flavor asqtad ensembles. We use the Fermilab method for the $b$ quark. We obtain chiral-continuum extrapolations for $E_K$ up to $\sim1.2$ GeV and then extend to the entire kinematic range with the model-independent $z$ expansion.

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Heavy-meson semileptonic decays for the Standard Model and beyond

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