The excited hadron spectrum in lattice QCD using a new variance reduction method
Colin Morningstar, A. Bell, C.Y. Chen, D. Lenkner, C.H. Wong, J., Bulava, J. Foley, K.J. Juge, M. Peardon
TL;DR
This paper introduces a new variance reduction technique in lattice QCD to improve the calculation of excited hadron spectra, demonstrating its effectiveness with the stochastic LapH method for better excited-state energy extraction.
Contribution
The paper presents the stochastic LapH method, a novel variance reduction approach, enhancing the accuracy of excited hadron spectrum calculations in lattice QCD.
Findings
Correlation matrices improve excited-state energy extraction
Stochastic LapH method effectively estimates low-lying quark effects
Enhanced precision in excited baryon and meson spectra
Abstract
Progress in calculating the spectrum of excited baryons and mesons in lattice QCD is described. Correlation matrices of sets of spatially-extended hadron operators have been studied and their effectiveness in facilitating the extraction of excited-state energies is demonstrated. First applications of the stochastic LapH method, a new method of estimating the low-lying effects of quark propagation, are presented.
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