Improved measurements of color-suppressed decaysB¯0→D0π0,D0η,D0ω,D*0π0,D*0ηandD*0ω
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Abstract
We present improved measurements of the branching fractions of the color-suppressed decays ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{(*)0}{h}^{0}$, where ${h}^{0}$ represents a light neutral meson ${\ensuremath{\pi}}^{0}$, $\ensuremath{\eta}$ or $\ensuremath{\omega}$. The measurements are based on a data sample of $140\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB energy-asymmetric ${e}^{+}{e}^{\ensuremath{-}}$ collider, corresponding to 7 times the luminosity of the previous Belle measurements. All the measured branching fractions fall in the range $1.4--2.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, which is significantly higher than theoretical predictions based on naive factorization.