## Abstract

Photoproduction of [Formula presented] is considered including the color-octet contributions from the various partial wave states, [Formula presented]. The production cross section depends on three new nonperturbative parameters defined in NRQCD, called the color-octet matrix elements. Using the color-octet matrix elements determined by fitting the [Formula presented] production at the Fermilab Tevatron, we find that the color-octet [Formula presented] contributions to the [Formula presented] photoproduction at the fixed target experiments and at DESY HERA are too large compared to the data on [Formula presented] in the forward direction, and the [Formula presented] distribution of [Formula presented]. The [Formula presented] distribution of [Formula presented] and the total inelastic [Formula presented] production rate as a function of [Formula presented] are predicted including color-octet contributions. We also briefly digress on the [Formula presented] and observe the similar situation. This may be an indication that the color-octet matrix elements determined from the [Formula presented] production at the Tevatron, especially [Formula presented] and [Formula presented], might have been overestimated by an order of magnitude.

Original language | English |
---|---|

Pages (from-to) | 4312-4325 |

Number of pages | 14 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 54 |

Issue number | 7 |

DOIs | |

Publication status | Published - 1996 |

Externally published | Yes |

## ASJC Scopus subject areas

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