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Measurement of double polarisation asymmetries in omega-photoproduction
Journal
Physics letters B
Volume
750
Pages / Article-Number
453-458
Abstract
The first measurements of the beam-target-helicity-asymmetries E and G in the photoproduction of omega-mesons off protons at the CBELSA/TAPS experiment are reported. E (G) was measured using circularly (linearly) polarised photons and a longitudinally polarised target. E was measured over the photon energy range from close to threshold (E-gamma = 1108 MeV) to E-gamma = 2300 MeV and G at a single energy interval of 1108 < E-gamma < 1300 MeV. Both measurements cover the full solid angle. The observables E and G are highly sensitive to the contribution of baryon resonances, with E acting as a helicity filter in the s-channel. The new results indicate significant s-channel resonance contributions together with contributions from t-channel exchange processes. A partial wave analysis reveals strong contributions from the partial waves with spin-parity J(P) = 3/2(+), 5/2(+), and 3/2(-). (C) 2015 The Authors. Published by Elsevier B.V.
