B Meson Decay Constants From NRQCD

Details B Meson Decay Constants From NRQCD B Meson Decay Constants From NRQCD

1998-01-27

arxiv.org/abs/hep-lat/9801038v3

Phys.Lett.B427:132-140,1998

Physics

High Energy Physics

High Energy Physics - Lattice

LaTeX file, 14 pages, typos corrected, to be published in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(98)00323-2

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

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