g(B*Bpi)-coupling in the static heavy quark limit

TL;DR

This paper uses lattice QCD simulations to calculate the coupling of heavy-light mesons to a soft pion in the static heavy quark limit, incorporating dynamical quarks and improved static quark propagators.

Contribution

It provides a new lattice QCD determination of the g(B*Bpi) coupling with dynamical quarks and improved static quark propagators, enhancing previous estimates.

Findings

Coupling g=0.44 +/- 0.03 with systematic uncertainties.

Inclusion of N_f=2 dynamical Wilson quarks.

Use of improved static quark propagator (HYP).

Abstract

By means of QCD simulations on the lattice, we compute the coupling of the heavy-light mesons to a soft pion in the static heavy quark limit. The gauge field configurations used in this calculations include the effect of N_f=2 dynamical Wilson quarks, while for the static quark propagator we use its improved form (so called HYP). On the basis of our results we obtain that the coupling g=0.44 +/- 0.03 (+0.07/-0.00), where the second error is flat (not gaussian).