AI Article Synopsis
- The study uses unquenched lattice QCD to calculate the differential branching fractions for the decay process B→Kℓ(+)ℓ(-) across various lepton types (ℓ=e, μ, τ), comparing these calculations with existing experimental data from Belle, BABAR, CDF, and LHCb.
- The researchers report a specific prediction for the branching fraction of B(B→Kτ(+)τ(-)) as (1.41±0.15)×10(-7) and provide values for the ratios of branching fractions R(e)(μ) and R(ℓ)(τ).
- They also compute the "flat term" in the angular distribution related to the differential decay
Article 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 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 the angular distribution of the differential decay rate F(H)(e,μ,τ) in experimentally motivated q2 bins.
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| http://dx.doi.org/10.1103/PhysRevLett.111.162002 | DOI Listing |
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