We compute the vector, scalar, and tensor form factors for the B→ π, B→ K, and Bₛ→ K amplitudes, which are needed to describe semileptonic B-meson decay rates for both the charged and neutral current cases. We use the highly improved staggered quark (HISQ) action for the sea and light valence quarks. The bottom quark is described by the clover action in the Fermilab interpretation. Simulations are carried out on Nf = 2+1+1 MILC HISQ ensembles at approximate lattice spacings from $0.15$ fm down to $0.057$ fm. We present blinded preliminary results for the form factors.
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Jeong et al. (2024) studied this question.
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