Matching lattice and continuum four-fermion operators with   nonrelativistic QCD and highly improved staggered quarks
  We match continuum and lattice heavy-light four-fermion operators at one loop in perturbation theory. For the heavy quarks we use nonrelativistic QCD and for the massless light quarks the highly improved staggered quark action. We include the full set of $\Delta B=2$ operators relevant to neutral $B$ mixing both within and beyond the Standard Model and match through order $\alpha_s$, $\Lambda_{\mathrm{QCD}}/M_b$, and $\alpha_s/(aM_b)$. 
Christopher Monahan, Elvira Gamiz, Ron Horgan, Junko Shigemitsu
hep-lat