Using a new analysis method to extract excited states in the scalar meson sector
Date
2016Publisher
Proceedings of Science (PoS)Source
Proceedings of Science34th Annual International Symposium on Lattice Field Theory, LATTICE 2016
Volume
Part F128557Google Scholar check
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We explore a method to extract energy eigenstates, called Athens Model Independent Analysis Scheme (AMIAS), which is an alternative to solving standard Generalized Eigenvalue Problems (GEVP). The method is based on statistically sampling the space of fit parameters according to the χ2 value of the fit function. The method is particularly suited for correlators or correlation matrices with strong contributions from several energy eigenstates and for rather noisy data, e.g. for correlators with disconnected and partly disconnected diagrams. We apply the method to the analysis of the JP =0+ channel in the context of our investigation of the a0(980) meson and point out advantages compared to the GEVP. © Copyright owned by the author(s).