Measurement of the ratio of branching fractionsB(D0→π−e+νe)/B(D0→K−e+νe)
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Abstract
Using 3.0 ${\mathrm{fb}}^{\mathrm{\ensuremath{-}}1}$ of data collected with the CLEO-II detector, we study the Cabibbo-suppressed decay ${\mathit{D}}^{0}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$. The ratio of the branching fractions B(${\mathit{D}}^{0}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$)/B(${\mathit{D}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$) is measured to be (10.3\ifmmode\pm\else\textpm\fi{}3.9\ifmmode\pm\else\textpm\fi{}1.3)%, corresponding to an upper limit of 15.6% at the 90% confidence level.
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