Precise Measurement of $B^{0}\to \bar{B^{0}$ Mixing Parameters at the $Υ($S)$

We describe a measurement of B^0-B^0bar mixing parameters exploiting a method of partial reconstruction of the decay chains B0 -> D^{*-}π^+ and B0 -> D^{*-}ρ^+. Using 9.6 x 10^6 BBbar pairs collected at the Cornell Electron Storage Ring, we find χ_d = 0.198 +- 0.013 +- 0.014, |y_d|<0.41 at 95% confidence level, and |Re(ε_B)|<0.034 at 95% confidence level.

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