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Absolute differential cross sections for the photoproduction of pions of 33.8-MeV laboratory kinetic energy from protons were measured at eight angles between 29.5 and 146.1° in the center-of-mass system. The over-all absolute accuracy is 4%, while the relative accuracy within the angular distribution is 3%. Comparison is made to various theoretical calculations, with and without inclusion of the effect of a γ−π−ρ-meson coupling. Existing calculations based on dispersion theory give only fair agreement with the data.

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Photoproduction of Charged Pi Mesons from Hydrogen and Deuterium

Jenkins, T.L. ; Luckey, D. ; Palfrey, T.R. ; et al.

Phys.Rev. 95 (1954) 179-184, 1954.

Inspire Record 944932 DOI 10.17182/hepdata.26426

Photoproduction cross sections of charged pi mesons from hydrogen and deuterium have been measured as a function of meson angle at gamma-ray energies of 200, 235, and 265 Mev. The angular range extends from 30° to 180° in the laboratory system. Absolute cross sections have been determined. A least-squares fit of the measured cross sections has been made to the expression A+Bcosθ+Csin2θ, which assumes only S and P wave scattering. The coefficients so determined are qualitatively consistent with electric and magnetic dipole absorption together with the assumption of a resonant state of angular momentum 32 and of energy close to 300 Mev. Comparison with neutral meson production indicates some direct charged meson production in the P state.

2 data tables

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THE REACTION pi+ n ---> p omega AT 13-GeV/c

Photoproduction of Charged Pions by 2- to 5-GeV Tagged gamma Rays

Absolute Positive Pion Photoproduction Cross Sections from Hydrogen

Photoproduction of Charged Pi Mesons from Hydrogen and Deuterium