Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-11-19
PoS LAT2009:151,2009
Physics
High Energy Physics
High Energy Physics - Lattice
Proceedings of the 27th International Symposium on Lattice Field Theory (Lattice 2009), Beijing, China, 2009 July 26-31. 8 pag
Scientific paper
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.
Blossier Benoit
Dimopoulos Petros
ETM Collaboration
Frezzotti Roberto
Herdoiza Gregorio
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