Thermodynamical Bethe Ansatz analysis in an SU(2)xU(1) symmetric sigma-model

Abstract

Four different types of free energies are computed by both thermodynamical Bethe Ansatz (TBA) techniques and by weak coupling perturbation theory in an integrable one-parameter deformation of the O(4) principal chiral sigma-model (with SU(2)xU(1) symmetry). The model exhibits both `fermionic' and `bosonic' type free energies and in all cases the perturbative and the TBA results are in perfect agreement, strongly supporting the correctness of the proposed S matrix. The mass gap is also computed in terms of the Lambda parameters of the modified minimal substraction scheme and a lattice regularized version of the model.

31 pages, Latex, minor changes, references added

References in corpus (1)

• Exact Form Factors in Integrable Quantum Field Theories: the Sine-Gordon Model

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