Pion photo- and electroproduction and the chiral MAID interface

Abstract

We discuss the extended on-mass-shell scheme for manifestly Lorentz-invariant baryon chiral perturbation theory. We present a calculation of pion photo- and electroproduction up to and including order $q^4$. The low-energy constants have been fixed by fitting experimental data in all available reaction channels. Our results can be accessed via a web interface, the so-called chiral MAID (http://www.kph.uni-mainz.de/MAID/chiralmaid/). We explain how our program works and how it can be used for further analysis.

20 pages, 12 figures, invited plenary talk given by S. Scherer at the 8th International Workshop on Chiral Dynamics, CD2015, 29 June 2015 - 03 July 2015, Pisa, Italy, draws on arXiv:1510.04602 [nucl-th]