Measurement of the CP-Violating Asymmetries in B0 -> KS pi0 and of the Branching Fraction of B0 -> K0 pi0

Abstract

We present a measurement of the time-dependent CP-violating asymmetries in $B^0\to K_S^0{\pi }^0$ decays based on 383 million ${\rm Y}(4S)\to B\bar{B}$ 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 $C_{K_S^0{\pi }^0}=0.24\pm 0.15\pm 0.03$ and the CP-violating asymmetry in the interference between mixing and decay $S_{K_S^0{\pi }^0}=0.40\pm 0.23\pm 0.03$, where the first errors are statistical and the second are systematic. On the same sample, we measure the decay branching fraction, obtaining $\mathcal{B}(B^0\to K^0{\pi }^0)=(10.3\pm 0.7\pm 0.6)\times 10^{-6}$.

arXiv comment8 pages, 2 postscript figure, submitted to PRD-RC

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• Implications for CP asymmetries of improved data on $B\to K^0{\pi }^0$
• Measurement of CP asymmetries in $B^0\to K^0{\pi }^0$ decays
• Searching For New Physics With B to K pi Decays
• Sum rule for rate and CP asymmetry in $B^{+}\to K^{+}{\pi }^0$
• Measurement of the mass and width of the Ds1(2536)+ meson
• The B-->pi K Puzzle and Supersymmetry
• U-Spin Tests of the Standard Model and New Physics
• Observation of the rare baryonic decay $B^{+}\to p\bar{\Lambda }$ and measurement of its weak decay parameter