Excited-State Effective Masses in Lattice QCD

Details Excited-State Effective Masses in Lattice QCD Excited-State Effective Masses in Lattice QCD

2009-03-13

arxiv.org/abs/0903.2314v1

Phys.Rev.D80:074506,2009

Physics

High Energy Physics

High Energy Physics - Lattice

18 pages, 6 figures

Scientific paper

10.1103/PhysRevD.80.074506

We apply black-box methods, i.e. where the performance of the method does not depend upon initial guesses, to extract excited-state energies from Euclidean-time hadron correlation functions. In particular, we extend the widely used effective-mass method to incorporate multiple correlation functions and produce effective mass estimates for multiple excited states. In general, these excited-state effective masses will be determined by finding the roots of some polynomial. We demonstrate the method using sample lattice data to determine excited-state energies of the nucleon and compare the results to other energy-level finding techniques.

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