Regge approach to charged-pion photoproduction at invariant energies above 2 GeV

Abstract

A Regge model with absorptive corrections is employed in a global analysis of the world data on positive and negative pion photoproduction for photon energies from 3 to 8 GeV. In this region resonance contributions are expected to be negligible so that the available experimental information on differential cross sections and single polarization observables at -t \leq 2 GeV^2 allows us to determine the non-resonant part of the reaction amplitude reliably. The model amplitude is then used to predict observables for photon energies below 3 GeV. Differences between our predictions and data in this energy region are systematically examined as possible signals for the presence of excited baryons. We find that the data available for the polarized photon asymmetry show promising resonance signatures at invariant energies around 2 GeV. With regard to differential cross sections the analysis of negative pion photoproduction data, obtained recently at JLab, indicates likewise the presence of resonance structures around 2 GeV

misprint in Table 3 corrected; reference added

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• P-wave excited baryons from pion- and photo-induced hyperon production
• Photoproduction of Z(4430) through mesonic Regge trajectories exchange
• Neutral pion photoproduction at high energies
• Analysis of recent eta photoproduction data
• Regge description of two pseudoscalar meson production in antiproton-proton annihilation
• Differential cross section and photon beam asymmetry for the gamma p -> pi+ n reaction at forward pi+ angles at Egamma=1.5-2.95 GeV