Pion Photoproduction off Nucleon with Hamiltonian Effective Field Theory

TL;DR

This paper uses Hamiltonian effective field theory to analyze pion photoproduction off nucleons, providing scattering amplitudes and emphasizing the importance of the triquark component in nucleon resonances for matching experimental data.

Contribution

It applies Hamiltonian effective field theory to pion photoproduction, offering new insights into nucleon resonances and the role of the triquark component in $N^*(1535)$.

Findings

Calculated scattering amplitudes for $ o o$ process.

Identified the significance of the triquark component in $N^*(1535)$.

Achieved better agreement with experimental data.

Abstract

We analyze the $\gamma N\to\pi N$ process in the negative parity channel with Hamiltonian effective filed theory which is successful in studying the nucleon resonances associated with the meson-nucleon scattering and lattice QCD simulations. We provide the scattering amplitude of pion photoproduction and extract the electric dipole amplitudes $E_{0+}$. The triquark component in $N^*(1535)$ is important for improving the consistence between our results and the experimental data.