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Rare decayB→Kℓ+ℓ−form factors from lattice QCD

By Chris Bouchard, G. Peter Lepage, Christopher Monahan, Heechang Na and Junko Shigemitsu


We calculate, for the first time using unquenched lattice QCD, form factors for the rare decay B→Kℓ+ℓ− in and beyond the Standard Model. Our lattice QCD calculation utilizes a nonrelativistic QCD formulation for the b valence quarks and the highly improved staggered quark formulation for the light valence quarks. We employ the MILC 2+1 asqtad ensembles. The form factor results, based on the z expansion, are valid over the full kinematic range of q2. We construct the ratios f0/f+ and fT/f+, which are useful in constraining new physics and verifying effective theory form factor symmetry relations. We also discuss the calculation of Standard Model observables

Publisher: American Physical Society
Year: 2013
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Provided by: Enlighten
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