Diffractive photoproduction of ups at HERA

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Published 15 April 1999 • Published under licence by IOP Publishing Ltd
, , Citation Leonid L. Frankfurt et al JHEP02(1999)002 DOI 10.1088/1126-6708/1999/02/002

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Author affiliations

1 Nuclear Physics Department, School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv, Israel

2 Dept. Physics and Astronomy, University of Manchester, Manchester, M13 9PL, England

3 Dept. of Physics, Penn. State University, University Park, USA

Dates

  1. Received 14 December 1998
  2. Accepted 1 February 1999
  3. Published

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Abstract

Predictions for the diffractive photoproduction of the Υ-family at HERA energies, within the framework of the analysis by Frankfurt, Koepf and Strikman, are presented. Two novel effects lead to a significant enhancement of the original calculation: the non-diagonal (or skewed) kinematics, calculated to leading-log(Q2) accuracy, and the large magnitude of the real part of the amplitude. The resultant cross sections are found to agree fairly well with recent preliminary data from ZEUS and H1. A strong correlation between the mass of the diffractively produced state and the energy dependence of the cross section is found. In particular, a considerably stronger rise in energy is predicted than that found in J/ψ-production.

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10.1088/1126-6708/1999/02/002