Pion photo- and electroproduction with chiral MAID

TL;DR

This paper develops a Lorentz-invariant chiral perturbation theory model for pion photo- and electroproduction, fitting experimental data to determine low-energy constants, and provides a web-based tool for further analysis.

Contribution

It introduces a comprehensive, Lorentz-invariant chiral perturbation theory calculation up to order q^4 for pion production, with an accessible web interface for researchers.

Findings

Accurately fits experimental data across all channels

Provides a publicly accessible web tool for analysis

Advances theoretical modeling of pion production processes

Abstract

We present a calculation of pion photo- and electroproduction in manifestly Lorentz-invariant baryon chiral perturbation theory up to and including order $q^4$. We fix the low-energy constants by fitting experimental data in all available reaction channels. Our results can be accessed via a web interface, the so-called chiral MAID. We explain how our program works and how it can be used for further analysis.