# perturbation theory: chiral

## $B_sto D_s/Bto D$ Semileptonic Form-Factor Ratios and Their Application to BR($Btextasciicircum0_sto mutextasciicircum+mutextasciicircum-$)

We calculate form-factor ratios between the semileptonic decays barB-textgreaterDtextasciicircum+elltextasciicircum-barnu and barB_s-textgreaterD_stextasciicircum+elltextasciicircum-barnu with lattice QCD. These ratios are a key theoretical input in …

## B- and D-meson decay constants from three-flavor lattice QCD

We calculate the leptonic decay constants of B_(s) and D_(s) mesons in lattice QCD using staggered light quarks and Fermilab bottom and charm quarks. We compute the heavy-light meson correlation functions on the MILC asqtad-improved staggered gauge …