Beam-helicity asymmetry in associated electroproduction of real photons ep → eγπN in the Δ-resonance region
Beam-helicity asymmetry in associated electroproduction of real photons ep → eγπN in the Δ-resonance region
The beam-helicity asymmetry in associated electroproduction of real photons, ep → eγπN , in the Δ(1232)-resonance region is measured using the longitudinally polarized Hera positron beam and an unpolarized hydrogen target. Azimuthal Fourier amplitudes of this asymmetry are extracted separately for two channels, ep → eγπ0 p and ep → …