η Photoproduction on the Proton for Photon Energies from 0.75 to 1.95 GeV

Phys. Rev. Lett. 89, 222002 – Published 12 November 2002
M. Dugger et al. (CLAS Collaboration)

Abstract

Differential cross sections for γpηp have been measured with tagged real photons for incident photon energies from 0.75 to 1.95 GeV. Mesons were identified by missing mass reconstruction using kinematical information for protons scattered in the production process. The data provide the first extensive angular distribution measurements for the process above W=1.75GeV. Comparison with preliminary results from a constituent quark model support the suggestion that a third S11 resonance with mass 1.8GeV couples to the ηN channel.

DOI: http://dx.doi.org/10.1103/PhysRevLett.89.222002

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  • Received 11 July 2002
  • Published 12 November 2002
  • Corrected 14 November 2002

© 2002 The American Physical Society

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