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Amplitude Analysis of γN → πN Observables Near Threshold |
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PP: 95-104 |
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doi:10.18576/jrna/060201
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Author(s) |
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Tarfa H. Alsheddi,
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Abstract |
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| Amplitude analysis of unpolarized differential cross section and polarization observables for the pion photoproduction reaction on the nucleon near threshold are studied. We investigate whether the uncertainties caused by the use of different γN → πN amplitudes for the predictions of polarization observables in the γd → πNN and γd → π0d reactions are also seen in the analysis of observables for pion photoproduction on the nucleon. For this purpose, three different realistic models for the γN → πN amplitude are considered. These models are the unitary dynamical Dubna-Mainz-Taipei DMT-2001 model, the unitary isobar MAID-2007 model, and the chiral MAID (χMAID-2013) model. It has been found that the γN → πN observables are sensitive to the production amplitude, specially at photon energies close to pion threshold.
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