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.

Finkenrath, J., Alexandrou, C., Berlin, J., Dalla Brida, M., Leontiou, T., Wagner, M. (2017). Using a new analysis method to extract excited states in the scalar meson sector. Intervento presentato a: 34th International Symposium on Lattice Field Theory (Lattice 2016), Southampton, UK [10.22323/1.256.0129].

Using a new analysis method to extract excited states in the scalar meson sector

Dalla Brida, M
Membro del Collaboration Group
;
2017

Abstract

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.
slide + paper
Lattice QCD; Hadron spectrum; Tetraquarks; Exotic mesons;
English
34th International Symposium on Lattice Field Theory (Lattice 2016)
2016
2017
256
1
7
129
https://pos.sissa.it/256/129
open
Finkenrath, J., Alexandrou, C., Berlin, J., Dalla Brida, M., Leontiou, T., Wagner, M. (2017). Using a new analysis method to extract excited states in the scalar meson sector. Intervento presentato a: 34th International Symposium on Lattice Field Theory (Lattice 2016), Southampton, UK [10.22323/1.256.0129].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/183329
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