A partial-wave analysis for proton Compton scattering in the delta(1232) energy region
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Abstract: (Elsevier)
Based on the nowadays available phenomenological multipoles for pion photoproduction, a systematic dispersion theoretic calculation of Compton partial amplitudes has been performed. By comparing with the new experimental data in the Δ(1232) region it is found that the hitherto existing discrepancies between the data and theory remain. Our results allow us to isolate the basis of this problem. It is due to the fact that the imaginary parts of the Compton amplitudes determined already by unitarity, give too large contributions to the cross section thus leaving no space for real parts required by the dispersion integrals.- photon p: interaction
- interaction: photon p
- p: compton scattering
- compton scattering: p
- pi: photoproduction
- photoproduction: pi
- partial-wave analysis: multipole
- unitarity
- interpretation of experiments
- numerical calculations
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