Measurement of the beam-helicity asymmetry in the p(epol,e'p)pi0 reaction at the energy of the Delta(1232) resonance
Abstract
In a p(epol,e'p)pi0 out-of-plane coincidence experiment at the 3-spectrometer setup of the Mainz Microtron MAMI, the beam-helicity asymmetry has been precisely measured around the energy of the Delta(1232) resonance and Q2 = 0.2 (GeV/c)2. The results are in disagreement with three up-to-date model calculations. This is interpreted as lack of understanding of the non-resonant background, which in dynamical models is related to the pion cloud.
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