Abstract
Compton scattering off the proton in the third resonance region is analyzed for the first time, owing to the full combined analysis of pion- and photo-induced reactions in a coupled-channel effective Lagrangian model with K-matrix approximation. Two isospin I=3/2 resonances D33(1700) and F35(1930) are found to be essential in the range of 1.6–1.8 GeV. The recent beam asymmetry data of Compton scattering from the GRAAL facility are used to determine the helicity couplings of these resonances, and strong constraints are coming also from πN and KΣ photoproduction data. The possible spin and parity of new narrow resonances is discussed.
Highlights
Compton scattering off the nucleon, as a reaction with subtle convolution of two different scales – electromagnetic and strong interactions, has attracted a lot of attention since a long time
The inelastic channels are emerging through coupled-channel effects and essential to the description of Compton scattering, which is dominated by the electromagnetic couplings [2]
The Giessen coupled-channel model accounted for Compton scattering from the very beginning on, but analyses were limited to the energies below 1.6 GeV due to the lack of the J = 5/2 partial waves and resonances at that time [4,5,6,7]
Summary
Compton scattering off the nucleon, as a reaction with subtle convolution of two different scales – electromagnetic and strong interactions, has attracted a lot of attention since a long time. The reaction mechanism of Compton scattering beyond the energy region of the (1232) resonance is rarely studied.
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