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.

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Persistent URL dx.doi.org/10.1103/PhysRevD.70.072001
Journal Physical Review D - Particles, Fields, Gravitation and Cosmology
Citation
Briere, R.A. (R. A.), Chen, G.P. (G. P.), Ferguson, T. (T.), Tatishvili, G. (G.), Vogel, H. (H.), Watkins, M.E. (M. E.), … Weinstein, A.J. (A. J.). (2004). New measurements of [Formula Presented] decays to charmonium final states. Physical Review D - Particles, Fields, Gravitation and Cosmology, 70(7). doi:10.1103/PhysRevD.70.072001