Pion photoproduction of nucleon excited states with Hamiltonian effective field theory

TL;DR

This paper discusses the application of Hamiltonian effective field theory to pion photoproduction of nucleon excited states, linking lattice QCD results with experimental data to better understand light resonances.

Contribution

It extends Hamiltonian effective field theory to electromagnetic processes, integrating lattice QCD and experimental data for a comprehensive analysis of nucleon excitations.

Findings

Hamiltonian effective field theory successfully models nucleon excited states.

The approach connects finite-volume lattice spectra to infinite-volume observables.

Recent developments include extending HEFT to electromagnetic interactions.

Abstract

Over the past few years, Hamiltonian effective field theory has been successfully applied to studies of nucleon and hyperon excited states. By discretizing the Hamiltonian in a finite volume, one can obtain the energy spectrum and compare it with the results calculated from lattice QCD. Through the analysis of experimental data, Hamiltonian effective field theory provides a framework that connects the finite-volume spectra from lattice QCD to infinite-volume scattering observables. The model independence of the approach is well preserved under the combined constraints from lattice QCD and experimental data. Building on these developments, recent works have attempted to extend HEFT to electromagnetic processes. Meanwhile, lattice QCD has also gradually advanced into the study of electromagnetic interactions. The combination of these analyses will undoubtedly deepen our understanding of light resonances.