Standard model predictions for B→Kℓ(+)ℓ- with form factors from lattice QCD.

@article{Bouchard2013StandardMP,
  title={Standard model predictions for B→Kℓ(+)ℓ- with form factors from lattice QCD.},
  author={Chris M. Bouchard and G. Peter Lepage and Christopher M Monahan and Heechang Na and Junko Shigemitsu},
  journal={Physical review letters},
  year={2013},
  volume={111 16},
  pages={162002}
}
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 R(e)(μ)=1.00029(69) and predict R(ℓ)(τ)=1.176(40), for ℓ=e, μ. Finally, we calculate the "flat term" in… CONTINUE READING
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