Measurements of the Cabibbo-Kobayashi-Maskawa angles beta and gamma at B factories: status and perspectives

por Fernando Martinez (IFIC)

viernes 14 oct. 2005 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

Over the past several years a wide variety of new techniques for measuring the angles of the unitarity triangle have been developped. The improved experimental framework has been accompained by a great success in the integrated delivered and accumulated luminosities at B Factories. The determination of the angle beta in the so-called golden modes has reached the status of precision measurement, free of theoretical uncertainties. On the contrary, the measurement of gamma was considered an impossible mission at B Factories a few years ago and was left to the second generation of B physics experiments (LHCb, SuperB). However, the new techniques have allowed the experiments to provide meaningful constraints, clean from theoretical uncertainties. The comparison of these measurements, together with additional measurements of beta in loop-dominated processes (b->s), provides an exceptional framework to test the Standard Model and look for New Physics, in both the B decay and B0-B0bar mixing. In this seminar I will review the state-of-the art of these measurements and their implications on the Standard Model health as well as on New Physics. I will also discuss the perspectives for the ultimate precision reachable by the first generation of B Factories (2008-2010).