Search for color-suppressed $B$ hadronic decay processes at the $Υ (4 S)$ resonance

Using

3.1 {fb}^{- 1}

of data accumulated at the

Υ (4 S)

by the CLEO-II detector, corresponding to

3.3 \times 10^{6}

B \bar{B}

pairs, we have searched for the color-suppressed

B

hadronic decay processes

B^{0} \to D^{0} {(D}^{* 0}) X^{0},

where

X^{0}

is a light neutral meson

π^{0},

ρ^{0},

η,

η^{'}

or ω. The

D^{* 0}

mesons are reconstructed in

D^{* 0} \to D^{0} π^{0}

and the

D^{0}

mesons in

D^{0} \to K^{-} π^{+},

K^{-} π^{+} π^{0}

and

K^{-} π^{+} π^{+} π^{-}

decay modes. No obvious signal is observed. We set 90% C.L. upper limits on these modes, varying from

1.2 \times 10^{- 4}

for

B^{0} \to D^{0} π^{0}

1.9 \times 10^{- 3}

for

B^{0} \to D^{* 0} η^{'} .

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Search for color-suppressedBhadronic decay processes at theΥ(4S)resonance