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Study of exclusive two-body<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>meson decays to charmonium
We present a study of three ${B}^{0}$ decay modes useful for time-dependent $\mathrm{CP}$ asymmetry measurements. From a sample of $9.7\ifmmode\times\else\texttimes\fi{}{10}^{6} B\overline{B}$ meson pairs collected with the CLEO detector, we have reconstructed ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}_{S}^{0},$ ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}{K}_{S}^{0},$ and ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{0}$ decays. The latter two decay modes have been observed for the first time. We describe …