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Heavy-meson semileptonic decays for the Standard Model and beyond

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arxiv 1312.3197 v1 pith:OGBKT3HA submitted 2013-12-11 hep-lat hep-ph

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
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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