CP violation in hadronic penguins at BABAR

Note: Please note special day: Wednesday, 3:30-4:30 pm
Speaker: Jim Hirschauer, University of Colorado

When: February 11, 2009 (Wed), 03:30PM to 04:30PM (add to my calendar)
Location: PRB 595

This event is part of the HEE Seminar Series.

Abstract: Measurements of time-dependent CP asymmetries in B0 meson decays through b —> ccbar s amplitudes have provided crucial tests of the mechanism of CP violation in the Standard Model (SM). These amplitudes contain the leading b-quark couplings, given by the Cabibbo-Kobayashi-Maskawa (CKM) flavor mixing matrix, for kinematically allowed transitions. Decays to charmless final states such as eta’K0, phiK0, pi0K0$, and omegaK0 are CKM-suppressed b —> qqbar s (q=u,d,s) processes dominated by a single loop (penguin) amplitude. This amplitude has the same weak phase of the CKM mixing matrix as that measured in the b —> ccbar s transition, but is sensitive to the possible presence of new heavy particles in the loop. We describe the measurement of time-dependent CP-violation parameters in the decays B0 —> eta’K0S and B0 —> eta’K0L. This measurement is based on the full BABAR dataset of 467 million BBbar pairs produced at the PEP-II asymmetric-energy $e^+e^-$ collider at the Stanford Linear Accelerator Center. For the discussion of consistency of measurements in b —> ccbar s and b —> qqbar s penguin decays, we also report recent BABAR measurements from other penguin modes: B0 —> phi K0S, pi0K0S, and omega K0S.