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Evidence for Nucleon-Resonance Excitation in $\omega$-Meson Photoproduction

Authors
  • Ajaka, J.
  • Assafiri, Y.
  • Bouchigny, S.
  • P. Didelez, J.
  • Fichen, L.
  • Guidal, M.
  • Hourany, E.
  • Kouznetsov, V.
  • Kunne, R.
  • N. Mushkarenkov, A.
  • Nedorezov, V.
  • Rudnev, N.
  • Turinge, A.
  • Zhao, Q.
Publication Date
Jan 01, 2006
Source
HAL-IN2P3
Keywords
Language
English
License
Unknown
External links

Abstract

The photoproduction of the omega meson has been studied at GRAAL from threshold up to a photon energy of 1.5 GeV. The differential cross sections and beam asymmetries have been measured precisely at all angles. The total cross section is also obtained. Systematic enhancements of the differential cross section at large angles and nonzero beam asymmetries at intermediate angles provide clear evidence for s- and u-channel resonant processes. The data are compared to the results of hadron and quark models.

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