Standard model predictions for B→Kℓ+ℓ−with form factors from lattice QCD

Bouchard, C. , Lepage, G. P., Monahan, C., Na, H. and Shigemitsu, J. (2013) Standard model predictions for B→Kℓ+ℓ−with form factors from lattice QCD. Physical Review Letters, 111(16), (doi: 10.1103/PhysRevLett.111.162002)

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Abstract

We calculate, for the first time using unquenched lattice QCD form factors, the standard model differential branching fractions dℬ/dq2(B→Kℓ+ℓ−) for ℓ=e, μ, τ and compare with experimental measurements by Belle, BABAR, CDF, and LHCb. We report on ℬ(B→Kℓ+ℓ−) in q2 bins used by experiment and predict ℬ(B→Kτ+τ−)=(1.41±0.15)×10−7. We also calculate the ratio of branching fractions Rμe=1.00029(69) and predict Rτℓ=1.176(40), for ℓ=e, μ. Finally, we calculate the “flat term” in the angular distribution of the differential decay rate Fe,μ,τH in experimentally motivated q2 bins.

Item Type:Articles
Status:Published
Refereed:Yes
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 Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1550-2368

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