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Form factors of Btoπellν and a determination of |V_(ub)| with M\"{o}bius domain-wall-fermions

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arxiv 2203.04938 v2 pith:NKB2VPPC submitted 2022-03-09 hep-lat hep-exhep-ph

Form factors of Btoπellν and a determination of |V_(ub)| with M\"{o}bius domain-wall-fermions

classification hep-lat hep-exhep-ph
keywords latticefactorsformbiuscomputedeterminationfermionheavy
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Using a fully relativistic lattice fermion action, we compute the form factors of the semileptonic decay $B\to\pi\ell\nu$, which is required for the determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{ub}|$. We employ the M\"{o}bius domain-wall fermion formalism for the generation of lattice ensembles with 2+1 sea quark flavours as well as for the valence heavy and light quarks. We compute the form factors at various values of the lattice spacing and multiple light and heavy quark masses, and extrapolate the results to the physical point. We combine our lattice results with the available experimental data to obtain $|V_{ub}| = (3.93\pm 0.41)\times 10^{-3}$.

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