Extraction of the resonance parameters at finite times Original Research Article

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 Δ-resonance, calculated at one loop in Small Scale Expansion. Further, the method is applied to a image-dimensional model with two coupled Ising spins and the results are compared with earlier ones obtained by using Lüscherʹs approach.