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

Bouchard, C. , Lepage, G. P., Monahan, C., Na, H. and Shigemitsu, J. (2013) Rare decayB→Kℓ+ℓ−form factors from lattice QCD. Physical Review D, 88(5), 054509. (doi: 10.1103/PhysRevD.88.054509)

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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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Bouchard, Dr Chris
Authors: Bouchard, C., Lepage, G. P., Monahan, C., Na, H., and Shigemitsu, J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN (Online):1550-2368

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