Centre d'études et d'expertise sur les risques, l'environnement, la mobilité et l'aménagement

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Using the latest determinations of several theoretical and experimental parameters, we update the Unitarity Triangle analysis in the Standard Model. The basic experimental constraints come from the measurements of |V ub /V cb |, ∆m d , the lower limit on ∆m s , ε K , and the measurement of the phase of the B d -B d mixing amplitude through the time-dependent CP asymmetry in B 0 → J/ψK 0 decays. In addition, we consider the direct determination of α, γ, 2β+γ and cos 2β from the measurements of new CP-violating quantities, recently performed at the B factories. We also discuss the opportunities offered by improving the precision of the various physical quantities entering in the determination of the Unitarity Triangle parameters. The results and the plots presented in this paper can also be found at the URL http://www.utfit.org, where they are continuously updated with the newest experimental and theoretical results.

An upgraded analysis of ǫ, x d and ǫ ′ /ǫ, using the latest determinations of the relevant experimental and theoretical parameters, is presented. Using the recent determination of the top quark mass, m t = (174 ± 17) GeV, our best estimate is ǫ ′ /ǫ = 3.1 ± 2.5, which lies in the range given by E731. We describe our determination of ǫ ′ /ǫ and make a comparison with other similar studies. A detailed discussion of the matching of the full theory to the effective Hamiltonian, written in terms of lattice operators, is also given.