We present precise lattice computations for the b-quark mass, the quark mass ratios mb/mc and mb/ms as well as the leptonic B-decay constants. We employ gauge configurations with four dynamical quark flavors, up-down, strange and charm, at three values of the lattice spacing (a∼0.06-0.09 fm) and for pion masses as low as 210 MeV. Interpolation in the heavy quark mass to the bottom quark point is performed using ratios of physical quantities computed at nearby quark masses exploiting the fact that these ratios are exactly known in the static quark mass limit. Our results are also extrapolated to the physical pion mass and to the continuum limit and read mb(MS,mb)=4.26(10) GeV, mb/mc=4.42(8), mb/ms=51.4(1.4), fBs=229(5) MeV, fB=193(6) MeV, fBs/fB=1.184(25) and (fBs/fB)/(fK/fπ)=0.997(17).

Bussone, A., Carrasco, N., Dimopoulos, P., Frezzotti, R., Lami, P., Lubicz, V., et al. (2016). Mass of the b quark and B -meson decay constants from Nf=2+1+1 twisted-mass lattice QCD. PHYSICAL REVIEW D, 93(11) [10.1103/PhysRevD.93.114505].

Mass of the b quark and B -meson decay constants from Nf=2+1+1 twisted-mass lattice QCD

LAMI, PAOLO;LUBICZ, Vittorio;PICCA, ELEONORA;RIGGIO, LORENZO;SIMULA, Silvano;TARANTINO, CECILIA
2016-01-01

Abstract

We present precise lattice computations for the b-quark mass, the quark mass ratios mb/mc and mb/ms as well as the leptonic B-decay constants. We employ gauge configurations with four dynamical quark flavors, up-down, strange and charm, at three values of the lattice spacing (a∼0.06-0.09 fm) and for pion masses as low as 210 MeV. Interpolation in the heavy quark mass to the bottom quark point is performed using ratios of physical quantities computed at nearby quark masses exploiting the fact that these ratios are exactly known in the static quark mass limit. Our results are also extrapolated to the physical pion mass and to the continuum limit and read mb(MS,mb)=4.26(10) GeV, mb/mc=4.42(8), mb/ms=51.4(1.4), fBs=229(5) MeV, fB=193(6) MeV, fBs/fB=1.184(25) and (fBs/fB)/(fK/fπ)=0.997(17).
Bussone, A., Carrasco, N., Dimopoulos, P., Frezzotti, R., Lami, P., Lubicz, V., et al. (2016). Mass of the b quark and B -meson decay constants from Nf=2+1+1 twisted-mass lattice QCD. PHYSICAL REVIEW D, 93(11) [10.1103/PhysRevD.93.114505].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/306883
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