arXiv:1212.0301·v1·High Energy Physics — Phenomenology
B-physics from lattice QCD...with a twist
N. Carrasco🇪🇸 · P. Dimopoulos🇮🇹 · R. Frezzotti🇮🇹 · V. Gimenez🇪🇸 · G. Herdoiza🇪🇸 · V. Lubicz🇮🇹 · G. Martinelli🇮🇹 · C. Michael🇬🇧 · D. Palao🇮🇹 · G. C. Rossi🇮🇹 · F. Sanfilippo🇫🇷 · A. Shindler🇨🇭 · S. Simula🇮🇹 · C. Tarantino🇮🇹
Abstract
We present a precise lattice QCD determination of the b-quark mass, of the B and Bs decay constants and first results for the B-meson bag parameters. For our computation we employ the so-called ratio method and our results benefit from the use of improved interpolating operators for the B-mesons. QCD calculations are performed with Nf = 2 dynamical light-quarks at four values of the lattice spacing and the results are extrapolated to the continuum limit. The preliminary results are mb(mb) = 4.35(12) GeV for the MSbar b-quark mass, fBs = 234(6) MeV and fB = 197(10) MeV for the B-meson decay constants, BBs(mb) = 0.90(5) and BB(mb) = 0.87(5) for the B-meson bag parameters.
Comments: 6 pages, 3 figures. Proceedings of the 36th International Conference on High Energy Physics - ICHEP 2012; July 4-11 2012; Melbourne, Australia