Measurement of Time-Dependent CP Asymmetry in B0 --> KS pi0 gamma Decays
Abstract
We measure the time-dependent CP asymmetry in B0 --> KS0 pi0 gamma decays for two regions of KS0-pi0 invariant mass, m(KS0 pi0), using the final BABAR data set of 467 x 106 BBbar pairs collected at the PEP-II e+e- collider at SLAC. We find 339 +/- 24 B0 --> K*0 gamma candidates and measure SK* gamma = -0.03 +/- 0.29 +/- 0.03 and CK* gamma = -0.14 +/- 0.16 +/- 0.03. In the range 1.1 < m(KS0 pi0) < 1.8 GeV/c2 we find 133 +/- 20 B0 --> KS0 pi0 gamma candidates and measure SKS0 pi0 gamma = -0.78 +/- 0.59 +/- 0.09 and CKS0 pi0 gamma = -0.36 +/- 0.33 +/- 0.04. The uncertainties are statistical and systematic, respectively.
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