B-meson decays andt-quark mass

On the basis of a recent left-right-symmetric model of electroweak interactions, in which natural flavor conservation is ensured and $\mathrm{CP}$ is spontaneously violated, an approach to generalized Cabibbo mixing in a six-quark picture is worked out. The specific form of the mixing-matrix elements in terms of the quark masses is derived and a consistent comparison with the present phenomenological knowledge of quark mixing is performed. In particular, $B$-meson decays are reviewed, by including nonspectator effects coming from annihilation and gluon-emission processes, with a careful treatment of the phase-space factors: the emerging picture on the one hand allows severely constraining the $t$-quark mass, and on the other hand leads to specific predictions about future measurements of the decay parameters.