Importance of the B , O + p + p - Branching Fraction ( * >

We discuss the Bi + p+p-decay channel, which is sensitive to deviations from the standard model. We also consider the Bt mixing information that could be obtained from these decays in the framework of the standard model. Finally, we comment on the experimental difficulties of observing the Bf + p+p "-channel. PACS13.20.-v-Leptonic and sernileptonic decays of mesons. To illustrate the usefulness of large BB data samples, we briefly discuss problems related to the measurement of rare B-decays, specifically, the Bt + Z?Z-channels where I E 7, p, e. These decays are expected to have small branching ratios (see below), but to be sensitive to deviations from the standard model. Moreover, these measurements could give additional information about Bi mixing that could complete our knowledge of the mixing observed for the Bj case with the e+e-+ T(4S) + BiBi experiments [l].