Time dependent CP violation in penguin dominated B decays

Abstract

We present a measurement of the CP violation parameters in B0 → KS0π0π0 and B0 → KS0KS0 decays using a data sample containing 657 × 106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e− collider operating at the γ(4S) resonance. We obtain S κπ0π0 = +0.43 ± 0.49 ± 0.09, Aκπ0π0 = -0.17 ± 0.24 ± 0.06, Sκs0κ0 = -0.38 ± 0.77 ± 0.08 and Aκs0κ0 = -0.38 ± 0.38 ± 0.05, where the first and second errors are statistical and systematic, respectively.