We report on a non-perturbative determination of the parameters of the lattice Heavy Quark Effective Theory (HQET) Lagrangian and of the time component of the heavy-light axial-vector current with Nf=2 flavors of massless dynamical quarks. The effective theory is considered at the 1/mh order, and the heavy mass mh covers a range from slightly above the charm to beyond the beauty region. These HQET parameters are needed to compute, for example, the b-quark mass, the heavy-light spectrum and decay constants in the static approximation and to order 1/mh in HQET. The determination of the parameters is done non-perturbatively. The computation reported in this paper uses the plaquette gauge action and two different static actions for the heavy quark described by HQET. For the light-quark action we choose non-perturbatively O(a)-improved Wilson fermions.

Blossier, B., Della Morte, M., Fritzsch, P., Garron, N., Heitger, J., Simma, H., et al. (2012). Parameters of heavy quark effective theory from N f = 2 lattice QCD. JOURNAL OF HIGH ENERGY PHYSICS [10.1007/JHEP09(2012)132].

Parameters of heavy quark effective theory from N f = 2 lattice QCD

TANTALO, NAZZARIO
2012

Abstract

We report on a non-perturbative determination of the parameters of the lattice Heavy Quark Effective Theory (HQET) Lagrangian and of the time component of the heavy-light axial-vector current with Nf=2 flavors of massless dynamical quarks. The effective theory is considered at the 1/mh order, and the heavy mass mh covers a range from slightly above the charm to beyond the beauty region. These HQET parameters are needed to compute, for example, the b-quark mass, the heavy-light spectrum and decay constants in the static approximation and to order 1/mh in HQET. The determination of the parameters is done non-perturbatively. The computation reported in this paper uses the plaquette gauge action and two different static actions for the heavy quark described by HQET. For the light-quark action we choose non-perturbatively O(a)-improved Wilson fermions.
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Rilevanza internazionale
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Esperti anonimi
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
eng
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Blossier, B., Della Morte, M., Fritzsch, P., Garron, N., Heitger, J., Simma, H., et al. (2012). Parameters of heavy quark effective theory from N f = 2 lattice QCD. JOURNAL OF HIGH ENERGY PHYSICS [10.1007/JHEP09(2012)132].
Blossier, B; Della Morte, M; Fritzsch, P; Garron, N; Heitger, J; Simma, H; Sommer, R; Tantalo, N
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/77878
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