Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-06-15
JHEP 0610:081,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 10 figures. v2: references added, version to appear in JHEP
Scientific paper
10.1088/1126-6708/2006/10/081
The recent measurements of the B_s meson mixing amplitude by CDF and of the leptonic branching fraction BR(B to tau nu) by Belle call for an upgraded analysis of the Unitarity Triangle in the Standard Model. Besides improving the previous constraints on the parameters of the CKM matrix, these new measurements, combined with the recent determinations of the angles alpha, beta and gamma from non-leptonic decays, allow, in the Standard Model, a quite accurate extraction of the values of the hadronic matrix elements relevant for K-Kbar and B_{s,d}-B_{s,d}bar mixing and of the leptonic decay constant f_B. These values, obtained ``experimentally'', can then be compared with the theoretical predictions, mainly from lattice QCD. In this paper we upgrade the UT fit, we determine from the data the kaon B-parameter B_Khat, the B^0 mixing amplitude parameters f_Bs B^{1/2}_Bs and xi, the decay constant f_B, and make a comparison of the obtained values with lattice predictions. We also discuss the different determinations of V_ub and show that current data do not favour the value measured in inclusive decays.
Bona Miklos
Ciuchini Marco
Franco Enrico
Lubicz Vittorio
Martinelli Gabriele
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