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Title: f_B and f_Bs with maximally twisted Wilson fermions
Authors: ETM Collaboration
Blossier, Benoit
Dimopoulos, Petros
Frezzotti, Roberto
Herdoiza, Gregorio
Jansen, Karl
Lubicz, Vittorio
Martinelli, Guido
Michael, Chris
Rossi, Giancarlo
Sanfilippo, Francesco
Shindler, Andrea
Simula, Silvano
Tarantino, Cecilia
Urbach, Carsten
Wagner, Marc
Keywords: Lattice QCD
Issue Date: 2009
Publisher: PoS - Proceedings of Science
Pages: 151
Abstract: We present a lattice QCD calculation of the heavy-light decay constants f_B and f_Bs performed with Nf=2 maximally twisted Wilson fermions, at four values of the lattice spacing. The decay constants have been also computed in the static limit and the results are used to interpolate the observables between the charm and the infinite-mass sectors, thus obtaining the value of the decay constants at the physical b quark mass. Our preliminary results are f_B=191(14) MeV, f_Bs=243(14) MeV, f_Bs/f_B=1.27(5). They are in good agreement with those obtained with a novel approach, recently proposed by our Collaboration (ETMC), based on the use of suitable ratios having an exactly known static limit.
Appears in Collections:X_Dipartimento di Fisica 'Edoardo Amaldi'
ATC - Atti di Convegno

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