Measurements of CP-violating Asymmetries in $B^0\to K_s^0{\pi }^0$ Decays

Abstract

We present a measurement of the time-dependent CP-violating (CPV) asymmetries in $B^0\to K_s^0{\pi }^0$ decays based on 124 million ${\rm Y}(4S)\to B\bar{B}$ decays collected with the BaBar detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. In a sample containing $122\pm 16$ signal decays, we obtain the magnitude of the direct CPV asymmetry $C_{K_s^0{\pi }^0}=0.40_{-0.28}^{+0.27}\pm 0.09$ and the magnitude of the CPV asymmetry in the interference between mixing and decay $S_{K_s^0{\pi }^0}=0.48_{-0.47}^{+0.38}\pm 0.06$ where the first error is statistical and the second systematic.

7 pages, 2 postscript figures, submitted to PRL

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