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Physics Letters B
The exact S-matrices proposed by Alexander and Alexey Zamolodchikov for the nonlinear o-model and Gross-Neveu model are verified to order 1IN 2 perturbation theory. This provides a good check of the nature of the bound state spectrum.doi:10.1016/0370-2693(78)90916-4 fatcat:qca6juoszbex7n42jmym476gzu