Update of Time-Dependent CP Asymmetry Measurements in $b$-->$c\bar{c}s$ Decays

Abstract

We present updated measurements of time-dependent CP asymmetries in fully reconstructed neutral B decays containing a charmonium meson. The measurements reported here use a data sample of $(465\pm 5)\times 10^6$ ${\rm Y}(4S)\to B\bar{B}$ decays collected with the BABAR detector at the PEP-II $B$ factory. The time-dependent CP asymmetry parameters measured from $J/\psi K_S^0$, $J/\psi K_L^0$, $\psi (2S)K_S^0$, ${\chi }_{c1}{K}_S^0$, ${\eta }_c{K}_S^0$, and $J/\psi K^{\ast 0}$ decays are \begin{eqnarray} C_f &=& 0.026 \pm 0.020(stat) \pm 0.016(syst), S_f &=& 0.691 \pm 0.029(stat) \pm 0.014(syst). \end{eqnarray}

19 pages, 3 postscript figures, submitted to ICHEP2008