Measurement of the Time-Dependent CP Asymmetry in B0 --> D(*)0_CP h0 Decays

Abstract

We report a measurement of the time-dependent CP-asymmetry parameters $\cal S$ and $\cal C$ in color-suppressed $B^0 \to D^{(*)0} h^0$ decays, where $h^0$ is a $π^0$, $η$, or $ω$ meson, and the $D^0$ decays to one of the CP eigenstates $K^+K^-$, $K_Sπ^0$, or $K_Sω$. The data sample consists of $383\times 10^{6}$ $Υ(4S)\to B\bar{B}$ decays collected with the BABAR detector at the PEP-II asymmetric-energy $B$-factory at SLAC. The results are ${\cal S}= -0.56 \pm 0.23 \pm 0.05$ and ${\cal C}= -0.23\pm 0.16\pm 0.04$, where the first error is statistical and the second is systematic.