Volume 21, Issue 4
Calculation of Resonance S-Matrix Poles by Means of Analytic Continuation in the Coupling Constant

Jirı Horacek and Lukas Pichl

10.4208/cicp.OA-2016-0068

Commun. Comput. Phys., 21 (2017), pp. 1154-1172.

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  • Abstract

The method of analytic continuation in the coupling constant in combination with the use of statistical Pad´e approximation is applied to the determination of complex S-matrix poles, i.e. to the determination of resonance energy and widths. These parameters are of vital importance in many physical, chemical and biological processes. It is shown that an alternative to the method of analytic continuation in the coupling constant exists which in principle makes it possible to locate several resonances at once, in contrast to the original method which yields parameters of only one resonance. In addition the new approach appears to be less sensitive to the choice of the perturbation interaction used for the analytical continuation than the original method. In this paper both approaches are compared and tested for model analytic separable potential. It is shown that the new variant of the method of analytic continuation in the coupling constant is more robust and efficient than the original method and yields reasonable results even for data of limited accuracy.

  • History

Published online: 2018-04

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