Measurement of time-dependentCPasymmetry inB0→cc¯K(*)0decays
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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 $(465\ifmmode\pm\else\textpm\fi{}5)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\mathit{\ensuremath{\Upsilon}}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at the PEP-II asymmetric energy ${e}^{+}{e}^{\ensuremath{-}}$ storage rings operating at the SLAC National Accelerator Laboratory. The time-dependent $CP$ asymmetry parameters measured from $J\ensuremath{\psi}{K}_{S}^{0}$, $J\ensuremath{\psi}{K}_{L}^{0}$, $\ensuremath{\psi}(2S){K}_{S}^{0}$, ${\ensuremath{\eta}}_{c}{K}_{S}^{0}$, ${\ensuremath{\chi}}_{c1}{K}_{S}^{0}$, and $J/\ensuremath{\psi}{K}^{*}(892{)}^{0}$ decays are: ${C}_{f}=0.024\ifmmode\pm\else\textpm\fi{}0.020(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.016(\mathrm{syst})$ and $\ensuremath{-}{\ensuremath{\eta}}_{f}{S}_{f}=0.687\ifmmode\pm\else\textpm\fi{}0.028(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.012(\mathrm{syst})$.
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