Analysis of $N^{\star}$ spectra using matrices of correlation functions based on irreducible baryon operators

Details Analysis of $N^{\star}$ spectra using matrices of correlation functions based on irreducible baryon operators Analysis of $N^{\star}$ spectra using matrices of correlation functions based on irreducible baryon operators

2004-09-15

arxiv.org/abs/hep-lat/0409082v1

Physics

High Energy Physics

High Energy Physics - Lattice

Lattice2004 (spectrum)

Scientific paper

We present results for ground and excited-state nucleon masses in quenched lattice QCD using anisotropic lattices. Group theoretical constructions of local and nonlocal straight-link irreducible operators are used to obtain suitable sources and sinks. Matrices of correlation functions are diagonalized to determine the eigenvectors. Both chi-square fitting and Bayesian inference with an entropic prior are used to extract masses from the correlation functions in a given channel. We observe clear separation of the excited state masses from the ground state mass. States of spin >= 5/2 have been isolated by use of G_2 operators.

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