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 HAL : in2p3-00025969, version 1
 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
 (2006)
 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.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 in2p3-00025969, version 1 http://hal.in2p3.fr/in2p3-00025969 oai:hal.in2p3.fr:in2p3-00025969 Contributeur : Suzanne Robert <> Soumis le : Mercredi 19 Avril 2006, 10:00:54 Dernière modification le : Mercredi 19 Avril 2006, 10:39:06