### Abstract

Using data collected by the CLEO III detector at CESR, we report on measurements of [Formula Presented] decays to charmonium final states. The data sample used for this analysis consists of [Formula Presented] [Formula Presented] decays, representing about 35 times more data than previous CLEO [Formula Presented] data samples. We present substantially improved measurements of the branching fraction [Formula Presented] using [Formula Presented] and [Formula Presented] decays. The branching fractions for these two modes are averaged, thereby obtaining: [Formula Presented]. A greatly improved measurement of the [Formula Presented] momentum distribution is presented and indicates a spectrum which is much softer than predicted by the color-octet model and somewhat softer than the color-singlet model. First measurements of the [Formula Presented] polarization and production angle are also presented. In addition, we report on the first observation of [Formula Presented] and evidence for [Formula Presented]. Their branching fractions are measured relative to [Formula Presented] and are found to be [Formula Presented], [Formula Presented], and [Formula Presented] at 90% confidence level. The resulting feed-down contributions to [Formula Presented] are [Formula Presented] for [Formula Presented], [Formula Presented] for [Formula Presented], [Formula Presented] for [Formula Presented], and [Formula Presented] at 90% confidence level for [Formula Presented]. These measurements (apart from [Formula Presented]) are about a factor of 2 larger than expected based on the color-octet model.

Original language | English (US) |
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Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 70 |

Issue number | 7 |

DOIs | |

State | Published - 2004 |

### ASJC Scopus subject areas

- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)

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## Cite this

*Physical Review D - Particles, Fields, Gravitation and Cosmology*,

*70*(7). https://doi.org/10.1103/PhysRevD.70.072001