arXiv:hep-th/0001097·v1·High Energy Physics — Theory
The Intrinsic Coupling in Integrable Quantum Field Theories
J. Balog (Research Institute for Particle and Nuclear Physics, Budapest)🇭🇺 · M. Niedermaier (University of Pittsburgh)🇺🇸 · F. Niedermayer (University of Bern)🇨🇭 · A. Patrascioiu (University of Arizona)🇺🇸 · E. Seiler (MPI, Munich)🇩🇪 · P. Weisz (MPI, Munich)🇩🇪
Abstract
The intrinsic 4-point coupling, defined in terms of a truncated 4-point function at zero momentum, provides a well-established measure for the interaction strength of a QFT. We show that this coupling can be computed non-perturbatively and to high accuracy from the form factors of an (integrable) QFT. The technique is illustrated and tested with the Ising model, the XY-model and the O(3) nonlinear sigma-model. The results are compared to those from high precision lattice simulations.
Comments: 69 pages, Latex