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Title: fB and fBs with maximally twisted Wilson fermions
Authors: 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
Heavy Quark Physics
Flavour Physics
Decay Constants
Issue Date: 2010
Publisher: Proceedings of Science SISSA
Pages: 151-158
Abstract: We present a lattice QCD calculation of the heavy-light decay constants fB and fBs 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 charmand the infinite-mass sectors, thus obtaining the value of the decay constants at the physical b quark mass. Our preliminary results are fB = 191(14)MeV, fBs = 243(14)MeV, fBs/ fB = 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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