We describe the method for extracting the elastic scattering phase shift from a lattice simulation at an introductory level, for non-lattice practitioners. We consider the scattering in a resonant channel, where the resulting phase shift delta(s) allows the lattice determination of the mass and the width of the resonance from a Breit-Wigner type fit. We present the method for the example of P-wave pi-pi scattering in the rho meson channel.
@article{arxiv.1110.4520,
title = {Scattering phase shift and resonance properties on the lattice: an introduction},
author = {S. Prelovsek and C. B. Lang and D. Mohler},
journal= {arXiv preprint arXiv:1110.4520},
year = {2011}
}