THE MEASUREMENT OF TIME-DEPENDENT CP-VIOLATING ASYMMETRIES IN LOOP-DOMINATED B DECAYS WITH BABAR

摘要

We report on preliminary measurements of time-dependent CP asymmetries in neutral B decays to CP eigenstates with transition amplitudes that are dominated by penguin-type loops. The results are obtained from a data sample of up to 227 million Υ(4S) → BB decays collected with the BABAR detector at the PEP-II asymmetric-energy B-meson Factory at SLAC. The amplitudes of the effective mixing-induced CP asymmetries, sin2β_(EFF), are derived from decay-time distributions of events in which one neutral B meson is fully reconstructed in a final state without charm and the other B meson is determined to be either a B~0 or B~0 from its decay products.