Nonperturbative evaluation of the few-body states for scalar $χ^2φ$ interaction

Details Nonperturbative evaluation of the few-body states for scalar $χ^2φ$ interaction Nonperturbative evaluation of the few-body states for scalar $χ^2φ$ interaction

1999-10-27

arxiv.org/abs/hep-ph/9910502v2

Comput.Phys.Commun. 135 (2001) 312-328

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 12 figures, accepted to be published in Computer Physics Communications

Scientific paper

10.1016/S0010-4655(00)00240-X

A knowledge of nonpertubative propagators is often needed when the standard perturbative methods are not applicable. An example of this is the bound state problem in field theory. While a nonperturbative result is valuable by itself, it is also an important guide for those who work on developing phenomenological models for the nonperturbative problem. The Feynman-Schwinger representation approach provides a convenient framework for calculating nonperturbative propagators. In this paper we provide an algorithm for computing 1,2, and 3 body bound states with the inclusion of all self energies, vertex corrections, ladder and crossed ladder exchanges. The calculation is done in the quenched approximation by ignoring the matter loops. We provide simulation results for 1,2 and 3-body states.

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