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.

Carrasco, N., Dimopoulos, P., Frezzotti, R., Gimenez, V., Herdoiza, G., Lubicz, V., et al. (2013). B-physics from lattice QCD...with a twist. In 36th International Conference on High Energy Physics (ICHEP2012) - Parallel Session 10 - Lattice QCD. SISSA [10.22323/1.174.0428].

B-physics from lattice QCD...with a twist

FREZZOTTI, ROBERTO;ROSSI, GIANCARLO;
2013

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.
International Conference on High Energy Physics (ICHEP 2012)
Melbourne (Australia)
2012
36.
Rilevanza internazionale
contributo
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
eng
bottom: mass; B: decay; B/s: decay; quantum chromodynamics; continuum limit; quark: mass: twist; quark: flavor: 2; numerical calculations: Monte Carlo
Intervento a convegno
Carrasco, N., Dimopoulos, P., Frezzotti, R., Gimenez, V., Herdoiza, G., Lubicz, V., et al. (2013). B-physics from lattice QCD...with a twist. In 36th International Conference on High Energy Physics (ICHEP2012) - Parallel Session 10 - Lattice QCD. SISSA [10.22323/1.174.0428].
Carrasco, N; Dimopoulos, P; Frezzotti, R; Gimenez, V; Herdoiza, G; Lubicz, V; . Martinelli, G; Michael, C; Palao, D; Rossi, G; Sanfilippo, F; Shindler, A; Simula, S; Tarantino, C
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/78580
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