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., Lami, P., Lubicz, V., Palao, D., et al. (2013). A Nf=2+1+1 "twisted" determination of the b-quark mass, fB and fBs. ??????? it.cilea.surplus.oa.citation.tipologie.CitationProceedings.prensentedAt ??????? 31st International Symposium on Lattice Field Theory (Lattice 2013), Mainz, Germany.

A Nf=2+1+1 "twisted" determination of the b-quark mass, fB and fBs

FREZZOTTI, ROBERTO;ROSSI, GIANCARLO;
2013

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).
31st International Symposium on Lattice Field Theory (Lattice 2013)
Mainz, Germany
2013
31
Wittig, H
Rilevanza internazionale
contributo
2013
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
eng
b-mass, B-pseudoscalar decay constants; lattice gauge theories
arXiv:1311.2837
Intervento a convegno
Carrasco, N., Dimopoulos, P., Frezzotti, R., Lami, P., Lubicz, V., Palao, D., et al. (2013). A Nf=2+1+1 "twisted" determination of the b-quark mass, fB and fBs. ??????? it.cilea.surplus.oa.citation.tipologie.CitationProceedings.prensentedAt ??????? 31st International Symposium on Lattice Field Theory (Lattice 2013), Mainz, Germany.
Carrasco, N; Dimopoulos, P; Frezzotti, R; Lami, P; Lubicz, V; Palao, D; Picca, E; Riggio, L; Rossi, G; Sanfilippo, F; Simula, S; Tarantino, C
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/95607
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