Bs→Kℓν form factors from lattice QCD

Bouchard, C.M. , Lepage, G. P., Monahan, C., Na, H. and Shigemitsu, J. (2014) Bs→Kℓν form factors from lattice QCD. Physical Review D, 90(5), 054506. (doi: 10.1103/PhysRevD.90.054506)

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Abstract

We report the first lattice QCD calculation of the form factors for the standard model tree-level decay Bs → Klν. In combination with future measurement, this calculation will provide an alternative exclusive semileptonic determination of jVubj. We compare our results with previous model calculations, make predictions for differential decay rates and branching fractions, and predict the ratio of differential branching fractions between Bs → Kτν and Bs → Kμν. We also present standard model predictions for differential decay rate forward-backward asymmetries and polarization fractions and calculate potentially useful ratios of Bs → K form factors with those of the fictitious Bs → ηs decay. Our lattice simulations utilize nonrelativistic QCD b and highly improved staggered light quarks on a subset of the MILC Collaboration 2 þ 1 asqtad gauge configurations, including two lattice spacings and a range of light quark masses.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bouchard, Dr Chris
Authors: Bouchard, C.M., 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:1550-7998
ISSN (Online):1550-2368
Copyright Holders:Copyright © 2014 American Physical Society
First Published:First published in Physical Review D 90(5): 054506
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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