Abstract
TheS-matrix of the massive Thirring model is calculated non-perturbatively using a momentum space discretization. This represents the first application of this technique to a fermionic model. We find agreement up to 3 digits with 2nd order perturbation theory in the small coupling regime. Renormalization effects are found to be small. Our results do not support the old analytic solution of theS-matrix by Berezin and Sushko, but do support that of Zamolodchikov and Zamolodchikov.
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