Scattering phases in the broken phase of the 4-d O(4) non-linear sigma-model
J. Westphalen, F. Zimmermann, M. Goeckeler, H. A. Kastrup
Abstract
Using Luescher's method we determine the elastic scattering phases in the broken phase of the 4-dimensional O(4) non-linear sigma-model from the two-particle energy spectrum in a Monte-Carlo study on finite lattices. In the isospin-0-channel we observe the sigma-resonance and extract its mass and its width. In all scattering channels investigated the results are consistent with perturbative calculations.
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