B meson decay constants from NRQCD

摘要

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) = 147(11)((+8)(-12))(9)(6) MeV and f(Bs)/f(B) = 1.20(4)((+4)(-0)). (C) 1998 Published by Elsevier Science B.V. All rights reserved. References: 30