Abstract
We report the status of an ongoing lattice-QCD calculation of form factors for exclusive semileptonic decays of B mesons with both charged currents (B → πlv, Bs → Klv) and neutral currents (B → πl+l-, B → Kl+l-). The results are important for constraining or revealing physics beyond the Standard Model. This work uses MILC’s (2+1 + 1)-flavor ensembles with the HISQ action for the sea and light valence quarks and the clover action in the Fermilab interpretation for the b quark. Simulations are carried out at three lattice spacings down to 0.088 fm, with both physical and unphysical sea-quark masses. We present preliminary results for correlation-function fits.
Highlights
Semileptonic decays of B(s) mesons are important to searches for new physics at the intensity frontier
Decays mediated at tree-level by charged currents, namely B → π ν and Bs → K ν, provide precise determinations of the CKM matrix element |Vub|
This element is crucial for testing CKM unitarity and important in the search for new physics
Summary
Semileptonic decays of B(s) mesons are important to searches for new physics at the intensity frontier. Decays mediated at tree-level by charged currents (see Figure 1, left), namely B → π ν and Bs → K ν , provide precise determinations of the CKM matrix element |Vub|. This element is crucial for testing CKM unitarity and important in the search for new physics. Exclusive determinations combine theoretical calculations of nonperturbative form factors with experimental measurements of decay rates. The purpose of this work is to improve theoretical confrontations with experiment, both by determining |Vub| in charged-current decays and by comparing branching fractions in neutral-current decays
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