B Meson Decay Constants From NRQCD
  We present quenched results for B meson decay constants using NRQCD b quarks and O(a) tadpole improved clover light quarks. For the first time, one-loop matching factors between lattice and continuum currents are incorporated through O(\alpha/M) taking operator mixing fully into account. This includes an important O(\alpha a) discretization correction to the heavy-light axial vector current. We find f_B = 0.147(11)(^{+8}_{-12})(9)(6) MeV and f_{B_s}/f_B = 1.20(4)(^{+4}_{-0}).   PACS numbers: 12.38.Gc, 12.39.Hg, 13.20.He, 14.40.Nd 
A.Ali Khan, T. Bhattacharya, S.Collins, C.T.H.Davies, R. Gupta,   C.Morningstar, J.Shigemitsu, J.Sloan