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$\bar B\to D^{(*)}\ell\bar ν$ Branching Ratios and Evidence for Isospin Breaking in $Υ(4S)$ Decays
We introduce a new method for the determination of the ratio of production fractions $R^{\pm0}=\mathcal B(Υ(4S)\to B^+B^-)/\mathcal B(Υ(4S)\to B^0\bar B^0)$ based on $\bar B\to D^{(*)}\ell\bar ν$ decays. Given the importance of these modes, we perform a comprehensive analysis of the available data,
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