Extraction of the resonance parameters at finite times

Details Extraction of the resonance parameters at finite times Extraction of the resonance parameters at finite times

2010-07-06

arxiv.org/abs/1007.0860v1

Nucl.Phys.B846:1-20,2011

Physics

High Energy Physics

High Energy Physics - Lattice

20 pages, 6 figures

Scientific paper

10.1016/j.nuclphysb.2010.12.011

In this paper we propose a model-independent method to extract the resonance parameters on the lattice directly from the Euclidean 2-point correlation functions of the field operators at finite times. The method is tested in case of the two-point function of the Delta-resonance, calculated at one loop in Small Scale Expansion. Further, the method is applied to a 1+1-dimensional model with two coupled Ising spins and the results are compared with earlier ones obtained by using Luescher's approach.

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