Jon A. Bailey

B →d ν form factors at nonzero recoil and |Vcb | from 2+1 -flavor lattice QCD

We present the first unquenched lattice-QCD calculation of the hadronic form factors for the exclusive decay

B→πlν semileptonic form factor from three-flavor lattice QCD: A model-independent determination of |Vub|

\overline{B}\ensuremath{\rightarrow}D\ensuremath{\ell}\overline{\ensuremath{\nu}}

Refining new-physics searches in B→Dτν with lattice QCD.

at nonzero recoil. We carry out numerical simulations on 14 ensembles of gauge-field configurations generated with

B→Kl+l−decay form factors from three-flavor lattice QCD

2+1

Refining New-Physics Searches inB→Dτνwith Lattice QCD

flavors of asqtad-improved staggered sea quarks. The ensembles encompass a wide range of lattice spacings (approximately 0.045 to 0.12 fm) and ratios of light (up and down) to strange sea-quark masses ranging from 0.05 to 0.4. For the

Erratum: B s→D s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ +μ -)

b

Update of

and

|V_{cb}|

c

from the

valence quarks we use improved Wilson fermions with the Fermilab interpretation, while for the light valence quarks we use asqtad-improved staggered fermions. We extrapolate our results to the physical point using rooted staggered heavy-light meson chiral perturbation theory. We then parametrize the form factors and extend them to the full kinematic range using model-independent functions based on analyticity and unitarity. We present our final results for

\bar{B}\to D^*\ell\bar{\nu}

{f}_{+}({q}^{2})