B Leptonic Decays and B- bar B Mixing with 2+1 Flavors of Dynamical Quarks

TL;DR

This paper presents calculations of B meson leptonic decays and mixing using advanced lattice QCD techniques with dynamical quarks, achieving reduced statistical errors and preliminary results for key matrix elements.

Contribution

It introduces a novel application of smearing in lattice QCD to improve the precision of B meson decay and mixing matrix element calculations with 2+1 flavors of dynamical quarks.

Findings

Reduced statistical errors in matrix element calculations

Preliminary results for f_{B_s}^2 B_{B_s}

Demonstration of smearing effectiveness in lattice QCD

Abstract

Calculations of B leptonic decays and B- bar B mixing using NRQCD heavy and Asqtad light valence quarks on the MILC dynamical configurations are described. Smearing has been implemented to substantially reduce the statistical errors of the matrix elements needed for the determination of f_B. The four-fermion matrix elements needed for the determination of f_{B_s}^2B_{B_s} have been calculated and a preliminary result is given.