# Measurement of the CP-Violating Asymmetries in $B^0 \to K^0_S \pi^0$ 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 $B^0 \to K^0_{\scriptscriptstyle S}\pi^0$ decays based on 383 million $\Upsilon(4S)\to B\kern 0.18em\bar{\kern -0.18em B}$ events collected by the \mbox{\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}} experiment at the PEP-II asymmetric-energy $B$ Factory at SLAC. We measure the direct CP-violating asymmetry $C_{K^0_{\scriptscriptstyle S}\pi^0} = 0.24 \pm 0.15 \pm 0.03$ and the CP-violating asymmetry in the interference between mixing and decay $S_{K^0_{\scriptscriptstyle S}\pi^0} = 0.40 \pm 0.23 \pm 0.03$, where the first errors are statistical and the second are systematic. On the same sample, we measure the decay branching fraction, obtaining ${\cal B}(B^0 \to K^0\pi^0)= (10.3 \pm 0.7 \pm 0.6)\times 10^{-6}$.
Document type :
Journal articles

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Contributor : Dominique Girod <>
Submitted on : Thursday, July 26, 2007 - 11:22:19 AM
Last modification on : Sunday, June 20, 2021 - 3:35:11 AM

### Citation

B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J.P. Lees, et al.. Measurement of the CP-Violating Asymmetries in $B^0 \to K^0_S \pi^0$ and of the Branching Fraction of $B^0 \to K^0 \pi^0$. Physical Review D, American Physical Society, 2008, 77, pp.012003. ⟨10.1103/PhysRevD.77.012003⟩. ⟨in2p3-00165456⟩

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