arXiv:0909.3187·v2·High Energy Physics — Lattice
A proposal for B-physics on current lattices
ETM collaboration · B. Blossier · P. Dimopoulos · R. Frezzotti · G. Herdoiza · K. Jansen · V. Lubicz · G. Martinelli · C. Michael · G.C. Rossi · A. Shindler · S. Simula · C. Tarantino · C. Urbach
Abstract
A method to extract B-physics parameters (b-quark mass and fB, fBs decay constants) from currently available lattice data is presented and tested. The approach is based on the idea of constructing appropriate ratios of heavy-light meson masses and decay constants, respectively, possessing a precisely known static limit, and evaluating them at various pairs of heavy quark masses around the charm. Via a smooth interpolation in the heavy quark mass from the easily accessible charm region to the asymptotic point, B-physics parameters are computed with a few percent (statistical + systematic) error using recently produced Nf=2 maximally twisted Wilson fermions data.
Comments: 23 pages, 8 figures; version to appear in JHEP