Observation of ${\bar{B}}^{0} \to D^{0} π^{0}$ and ${\bar{B}}^{0} \to D^{* 0} π^{0}$

Publisher Website

24 January 2002

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 88 (6) , 062001
https://doi.org/10.1103/physrevlett.88.062001

Abstract

We have studied the color-suppressed hadronic decays of neutral B mesons into the final states

D^{(*) 0} π^{0}

. Using

9.67 \times 10^{6}

B \bar{B}

pairs collected with the CLEO detector, we observe the decays

{\bar{B}}^{0} \to D^{0} π^{0}

and

{\bar{B}}^{0} \to D^{* 0} π^{0}

with the branching fractions

B ({\bar{B}}^{0} \to D^{0} π^{0}) = ({2.74}_{- 0.32}^{+ 0.36} \pm 0.55) \times 10^{- 4}

and

B ({\bar{B}}^{0} \to D^{* 0} π^{0}) = ({2.20}_{- 0.52}^{+ 0.59} \pm 0.79) \times 10^{- 4}

. The first error is statistical and the second systematic. The statistical significance of the

D^{0} π^{0}

signal is

12.1 σ

(

5.9 σ

for

D^{* 0} π^{0}

). Utilizing the

{\bar{B}}^{0} \to D^{(*) 0} π^{0}

branching fractions we determine the strong phases

δ_{I, D (*)}

between isospin

1 / 2

and

3 / 2

amplitudes in the

D π

and

D^{*} π

final states to be

\cos δ_{I, D} = 0.89 \pm 0.08

and

\cos δ_{I, D *} = 0.89 \pm 0.08

, respectively.

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