The B -> pi l nu form factor from unquenched lattice QCD with domain-wall light quarks and relativistic b-quarks

TL;DR

This paper presents a lattice-QCD calculation of the B to pi l nu form factor using domain-wall light quarks and relativistic b-quarks, providing initial results from multiple lattice spacings and volumes.

Contribution

First calculation of the B to pi l nu form factor with unquenched lattice QCD using domain-wall and relativistic b-quarks.

Findings

Initial results from coarser and finer lattices

Demonstrates feasibility of the approach

Provides data for improving CKM matrix element determinations

Abstract

We report on a lattice-QCD calculation of the B to pi l nu form factor with domain-wall light quarks and relativistic b-quarks using the 2 + 1 flavor domain-wall fermion and Iwasaki gauge-field ensembles generated by the RBC and UKQCD Collaborations. We present initial results obtained from the coarser (a ~ 0.11 fm) 24^3 lattices and some of the finer (a ~ 0.086 fm) 32^3 lattices.