Friday, February 13, 2009, 9:30 am — Small Seminar Room, Bldg. 510
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.
Hosted by: Hong Ma
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