Progress Report on Computing Excited-State Hadron Masses in Lattice QCD

TL;DR

This paper reports progress in calculating excited-state hadron spectra in lattice QCD using novel stochastic methods and diverse hadron operators, enabling more reliable extraction of spectral information for baryons and mesons.

Contribution

Introduces a new stochastic estimation method for low-lying quark effects and applies it to excited hadron spectra in lattice QCD.

Findings

Successful testing on isoscalar mesons in multiple channels

Reliable determinations of temporal correlations achieved

Method applicable to multi-hadron systems

Abstract

Our progress in computing the spectrum of excited baryons and mesons in lattice QCD is described. Sets of spatially-extended hadron operators with a variety of different momenta are used. A new method of stochastically estimating the low-lying effects of quark propagation is utilized which allows reliable determinations of temporal correlations of both single-hadron and multi-hadron operators. The method is tested on the isoscalar mesons in the scalar, pseudoscalar, and vector channels, and on the two-pion system of total isospin I=0,1,2.