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Physics Letters B
The first measurements of the beam-target-helicity-asymmetries E and G in the photoproduction of ω-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_γ = 1108 MeV) to E_γ = 2300 MeV and G at a single energy interval of 1108 < E_γ <1300 MeV. Both measurements cover the full solid angle. The observables E and Gdoi:10.1016/j.physletb.2015.09.049 fatcat:kwya22qr7zg5lkblzanrbx2fte