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Analyticity constitutes a rigid constraint on hadron scattering amplitudes.This property is used to relate models in different energy regimes. Using mesonphotoproduction as a benchmark, we show how to test contemporary low energymodels directly against high energy data. This method pinpoints deficiencies ofthe models and treads a path to further improvement. The implementation of thistechnique enables one to produce more stable and reliable partial waves forfuture use in hadron spectroscopy and new physics searches.

Analyticity Constraints for Hadron Amplitudes: Going High to Heal Low Energy Issues