Heavy-light decay constants from relativistic Nf=2,0 QCD

TL;DR

This paper reports on the calculation of B and Bs meson decay constants using relativistic lattice QCD with two flavors of sea quarks, analyzing effects of sea quarks and employing the Fermilab formalism for heavy quarks.

Contribution

It provides new unquenched lattice QCD results for decay constants using multiple gauge couplings and sea quark masses, with a comparison to quenched calculations.

Findings

Decay constants calculated for different sea quark masses.

Sea quark effects on decay constants analyzed.

Results compared with quenched calculations.

Abstract

We present results on an analysis of the decay constants fB and fBs with two flavours of sea quark. The calculation has been carried out on 3 different bare gauge couplings and 4 sea quark masses at each gauge coupling, with m_pi/m_rho ranging from 0.8 to 0.6. We employ the Fermilab formalism to perform calculations with heavy quarks whose mass is in the range of the b-quark. A comparison with a quenched calculation using the same action is made to elucidate the effects due to the sea quarks.