First Observation of the Decay $B^{0} \to D^{* +} D^{* -}$

Publisher Website

12 April 1999

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

Vol. 82 (15) , 3020-3024
https://doi.org/10.1103/physrevlett.82.3020

Abstract

We have observed four fully reconstructed

B^{0} \to D^{* +} D^{* -}

candidates in

5.8 \times 10^{6}

ϒ (4 S) \to B \bar{B}

decays recorded with the CLEO detector. The background is estimated to be

0.31 \pm 0.10

events. The probability that the background could produce four or more signal candidates with the observed distribution among

D^{* +}

and

D^{* -}

decay modes is

1.1 \times 10^{- 4}

. The measured decay rate,

B (B^{0} \to D^{* +} D^{* -}) = [{6.2}_{- 2.9}^{+ 4.0} (stat) \pm 1.0 (syst)] \times 10^{- 4}

, is large enough for this decay mode to be of interest for the measurement of a time-dependent CP asymmetry.

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Version 1, 1998-11-16, ArXiv

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