## Abstract

Fermilab experiment E835 has observed [Formula presented] annihilation production of the charmonium state [Formula presented] and its subsequent decay into [Formula presented]. Although the resonant amplitude is an order of magnitude smaller than that of the nonresonant continuum production of [Formula presented], an enhanced interference signal is evident. A partial wave expansion is used to extract physics parameters. The amplitudes [Formula presented] and [Formula presented], of comparable strength, dominate the expansion. Both are accessed by [Formula presented] in the entrance [Formula presented] channel. The product of the input and output branching fractions is determined to be [Formula presented].

Original language | English (US) |
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Journal | Physical review letters |

Volume | 91 |

Issue number | 9 |

DOIs | |

State | Published - Aug 28 2003 |