Observation of ${\bar{B}}^0\to D^0{\pi }^0$ and ${\bar{B}}^0\to D^{\ast 0}{\pi }^0$

Abstract

We have studied the color-suppressed hadronic decays of neutral B mesons into the final states D(*)0 pi0. Using 9.67 million B-pairs collected with the CLEO detector, we observe the decays B0bar -> D0 pi0 and B0bar -> D*0 pi0 with the branching fractions BR(B0bar -> D0 pi0) = (2.74 -0.32 +0.36 +-0.55) 10^{-4} and BR(B0bar -> D*0 pi0) = (2.20 -0.52 +0.59 +-0.79) 10^{-4}. The first error is statistical and the second systematic. The statistical significance of the D0 pi0 signal is 12.1 sigma (5.9 sigma for D*0 pi0). Utilizing the B0bar -> D(*)0 pi0 branching fractions we determine the strong phases delta_I between isospin 1/2 and 3/2 amplitudes in the D pi and D* pi final states to be cos delta_I = 0.89 +- 0.08 and cos delta_I = 0.89 +- 0.08, respectively.

10 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, to appear in PRL

References in corpus (2)

• Comments on Color-Suppressed Hadronic B Decays
• Observation of Color-suppressed ${\bar{B}}^0\to D^0{\pi }^0$, $D^{\ast 0}{\pi }^0$, $D^0\eta$, and $D^0\omega$ Decays

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