"We present a lattice QCD determination of the b-quark mass and of the fBs and fB decay constants performed with Nf=2+1+1 twisted mass Wilson fermions. We have used simulations at three values of the lattice spacing generated by ETMC with pion masses ranging from 210 to 440 MeV. To obtain physical quantities we performed a combined chiral and continuum limit and an extrapolation in the heavy quark mass from the charm to the b-quark region using suitable ratios calculated at nearby heavy-quark masses having an exactly known static limit. Our results are: mb(mb)=4.29(13) GeV, fB=196(9) MeV, fBs=235(9) MeV, fBs\/fB=1.201(25), (fBs\/fB)\/(fK\/fπ)=1.007(16) and (fBs\/fB)\/(fDs\/fD)=1.008(13)."
Carrasco, N., Dimopoulos, P., Frezzotti, R., Gimenez, V., Lami, P., Lubicz, V., et al. (2013). A $N_f=2+1+1$ "twisted" determination of the b-quark mass, $f_B$ and $f_{B_s}$. In PoS LATTICE2013 (2014) 313.
A $N_f=2+1+1$ "twisted" determination of the b-quark mass, $f_B$ and $f_{B_s}$
LUBICZ, Vittorio;PICCA, ELEONORA;TARANTINO, CECILIA
2013-01-01
Abstract
"We present a lattice QCD determination of the b-quark mass and of the fBs and fB decay constants performed with Nf=2+1+1 twisted mass Wilson fermions. We have used simulations at three values of the lattice spacing generated by ETMC with pion masses ranging from 210 to 440 MeV. To obtain physical quantities we performed a combined chiral and continuum limit and an extrapolation in the heavy quark mass from the charm to the b-quark region using suitable ratios calculated at nearby heavy-quark masses having an exactly known static limit. Our results are: mb(mb)=4.29(13) GeV, fB=196(9) MeV, fBs=235(9) MeV, fBs\/fB=1.201(25), (fBs\/fB)\/(fK\/fπ)=1.007(16) and (fBs\/fB)\/(fDs\/fD)=1.008(13)."I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
