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Roy-Steiner equations for
Martin Hoferichter, Daniel R. Phillips, Carlos Schat
Starting from hyperbolic dispersion relations, we present a system of Roy--Steiner equations for pion Compton scattering that respects analyticity and unitarity requirements, gauge…
Precision calculation of threshold pi^- d scattering, pi N scattering lengths, and the GMO sum rule
V. Baru, C. Hanhart, M. Hoferichter +3
We use chiral perturbation theory (ChPT) to calculate the scattering length with an accuracy of a few percent, including isospin-violating corrections both in the two- and…
Roy-Steiner equations for gamma gamma -> pi pi
Martin Hoferichter, Daniel R. Phillips, Carlos Schat
Starting from hyperbolic dispersion relations, we derive a system of Roy--Steiner equations for pion Compton scattering that respects analyticity, unitarity, gauge invariance, and…