Before the starting of the B factories, the Unitarity Triangle (UT) analysis relied on the results of lattice QCD simulations to relate the experimental determinations of semileptonic B decays, K-0-(K) over bar (0) and B-d,s(0)-(B) over bar (0)(d,s) mixing to the CKM parameters. In the last years, much more information has been obtained from the direct determination of the UT angles from non-leptonic B decays. In this talk, we compare the results of the "classical" UT analysis (UTlattice) with the analysis based on the angles determinations (UTangles). We show that the recent measurement of Delta m(s), combined with Delta m(d) and epsilon(K), allows from this comparison a quite accurate extraction of the values of the lattice parameters; (B) over cap (K), f(Bs)(B) over cap (1/2)(Bs), xi and f(B). These values, obtained "experimentally" by assuming the validity of the Standard Model, can be compared with the theoretical predictions from lattice QCD. We also discuss the different determinations of V-ub and show that current data do not favor the value measured in inclusive decays. Finally; we present updated predictions for the leptonic branching fraction BR(B -> tau nu(tau)), and compare them with the recent experimental determination. We take the opportunity of this write up to update the results of ref. (1) with the most recent results presented at the ICHEP'06 conference.

Lubicz, V., Bona, M., Ciuchini, M., Franco, E., Martinelli, G., Parodi, F., et al. (2007). Lattice QCD confronts the Unitarity Triangle fit. In Proceedings of the 1st Workshop on Theory, Phenomenology and Experiment in Heavy Flavour Physics (pp.43-49) [10.1016/j.nuclphysbps.2006.10.007].

Lattice QCD confronts the Unitarity Triangle fit

LUBICZ, Vittorio;
2007-01-01

Abstract

Before the starting of the B factories, the Unitarity Triangle (UT) analysis relied on the results of lattice QCD simulations to relate the experimental determinations of semileptonic B decays, K-0-(K) over bar (0) and B-d,s(0)-(B) over bar (0)(d,s) mixing to the CKM parameters. In the last years, much more information has been obtained from the direct determination of the UT angles from non-leptonic B decays. In this talk, we compare the results of the "classical" UT analysis (UTlattice) with the analysis based on the angles determinations (UTangles). We show that the recent measurement of Delta m(s), combined with Delta m(d) and epsilon(K), allows from this comparison a quite accurate extraction of the values of the lattice parameters; (B) over cap (K), f(Bs)(B) over cap (1/2)(Bs), xi and f(B). These values, obtained "experimentally" by assuming the validity of the Standard Model, can be compared with the theoretical predictions from lattice QCD. We also discuss the different determinations of V-ub and show that current data do not favor the value measured in inclusive decays. Finally; we present updated predictions for the leptonic branching fraction BR(B -> tau nu(tau)), and compare them with the recent experimental determination. We take the opportunity of this write up to update the results of ref. (1) with the most recent results presented at the ICHEP'06 conference.
2007
Lubicz, V., Bona, M., Ciuchini, M., Franco, E., Martinelli, G., Parodi, F., et al. (2007). Lattice QCD confronts the Unitarity Triangle fit. In Proceedings of the 1st Workshop on Theory, Phenomenology and Experiment in Heavy Flavour Physics (pp.43-49) [10.1016/j.nuclphysbps.2006.10.007].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/175413
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