# Measurement of the CP-violating Asymmetries in $B^0 \to K_S^0 \pi^0$ and of the Branching Fraction of $B^0 \to K^0 \pi^0$

Abstract : We present a measurement of the time-dependent CP-violating asymmetries in B0 -> K0S pi0 decays based on 348 million Y(4S) -> BBbar events collected by the BABAR experiment at the PEP-II asymmetric-energy B Factory at SLAC. We measure the direct CP-violating asymmetry C_{K0S pi0} = 0.20 +/- 0.16 +/- 0.03 and the CP-violating asymmetry in the interference between mixing and decay S_{K0S pi0} = 0.33 +/- 0.26 +/- 0.04 where the first error is statistical and the second systematic. On the same sample, we measure the decay branching fraction, obtaining B(B0 -> K0S pi0)= (10.5 +/- 0.7 +/- 0.5) 10^{-6}. All results presented here are preliminary.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00117419
Contributor : Dominique Girod <>
Submitted on : Friday, December 1, 2006 - 3:20:07 PM
Last modification on : Sunday, June 20, 2021 - 3:35:09 AM

### Citation

B. Aubert, R. Barate, M. Bona, D. Boutigny, F. Couderc, et al.. Measurement of the CP-violating Asymmetries in $B^0 \to K_S^0 \pi^0$ and of the Branching Fraction of $B^0 \to K^0 \pi^0$. 33rd International Conference on High-Energy Physics, ICHEP 06, Jul 2006, Moscou, Russia. ⟨in2p3-00117419⟩

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