First Observation of the B(sup O)(sub s)yields K(sup +)K(sup -)Decay Mode, and Measurement of the B(sup O) and B(sup O)(sub 5) Measons Decay-Rates into Two-Body, Charmless Final States at CDF.
The decays of b-hadrons are a fertile ground to investigate the flavor sector of the Standard Model and to look for first signals for new physics in the years preceding the Large Hadron Collider operations. In particular, the phenomenology of non-leptonic charmless two-body decays of b-mesons offers rich opportunities for increasing our understanding of the CP violation, i. e., the lack of symmetry of physical processes when all spatial coordinates are inverted and particles are replaced by their antiparticles. The precise measurements obtained recently at dedicated e+e- colliders already provided demonstration of the central role of these decay modes. Charmless hadronic b-meson decays proceed through an unique interplay of electroweak and low-energy strong interactions, allowing observation of CP-violating effects within and beyond the Standard Model. The problem is that, currently, no completely reliable theoretical prediction of decay rates is available, for most of them, because of the presence of strong interactions in nonperturbative regime, which introduce significant uncertainties in the predicted amplitudes. Several phenomenological models provide different predictions, none of them properly accounting for all observed decay-rates. This makes the interpretation of experimental observations difficult, since any discrepancy between predictions and measurements may be ascribed either to improper treatment of hadronic uncertainties, or to contributions of amplitudes not expected in the Standard Model.
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