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Physical Review Letters 96 (2006) 132003
Evidence for Nucleon-Resonance Excitation in $\omega$-Meson Photoproduction
J. Ajaka1, Y. Assafiri1, S. Bouchigny1, J. P. Didelez1, L. Fichen1, M. Guidal1, E. Hourany1, V. Kouznetsov, R. Kunne1, A. N. Mushkarenkov, V. Nedorezov, N. Rudnev, A. Turinge, Q. Zhao1, 2

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.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  DEPARTMENT OF PHYSICS - University of Surrey
Physique/Physique des Hautes Energies - Expérience