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Observation of CP violation in B0 -> eta' K0 Decays

The BABAR Collaboration, B. Aubert

hep-exarXiv:hep-ex/0609052

Abstract

We present measurements of the time-dependent CP-violation parameters S and C in B0 --> eta' K0 decays. The data sample corresponds to 384 million B Bar pairs produced by e+ e- annihilation at the Y(4S). The results are S = 0.58 +- 0.10 +- 0.03 and C = -0.16 +- 0.07 +- 0.03. We observe mixing-induced CP violation with a significance of 5.5 standard deviations in this b -> s penguin dominated mode.

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