Abstract
We calculate the scattering amplitudes of composite Goldstone bosons in the (2+1)-dimensional four-Fermi model, using the technique of 1/ N expansion. The Goldstone bosons correspond to the symmetry breaking pattern U L( n)×U R( n)→U( n). The effective lagrangian describing the low-energy scattering is explicitly derived. We also compute the effects of explicit symmetry breaking parameters. Unitary in the context of the 1/ N expansion is analyzed in some detail.
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