Pion photoproduction off nucleons in covariant chiral perturbation theory

Abstract

Pion photoproduction off the nucleon close to threshold is studied in covariant baryon chiral perturbation theory at O($p^3$) in the extended-on-mass-shell scheme, with the explicit inclusion of the $\Delta (1232)$ resonance using the $\delta$ counting. The theory is compared to the available data of cross sections and polarization observables for all the charge channels. Most of the necessary low energy constants are well known from the analysis of other processes and the comparison with data strongly constrains some of the still unknown ones. The $\Delta (1232)$ contribution is significant in improving the agreement with data, even at the low energies considered.

Revised version

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Cited by in corpus (9)

• Nuclear Currents in Chiral Effective Field Theory
• Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles
• Threshold pion electro- and photoproduction off nucleons in covariant chiral perturbation theory
• Pion Photoproduction off Nucleon with Hamiltonian Effective Field Theory
• Dispersive Analysis of Low Energy $\gamma N\to \pi N$ Process and Studies on the $N^{\ast }(890)$ Resonance
• Radiative Correction to Lepton Proton Scatterings in Manifestly Lorentz-Invariant Chiral Perturbation Theory
• Dispersive analysis of low energy ${\gamma }^{\ast }N\to \pi N$ process
• Assessing the theory-data tension in neutrino-induced charged pion production: the effect of final-state nucleon distortion
• Radiative pion photoproduction in covariant chiral perturbation theory