Is the Quenched Spectrum in agreement with Experiment?

TL;DR

This paper investigates the meson spectrum in quenched QCD using lattice gauge theory, comparing results with experimental data and highlighting discrepancies in pseudoscalar and vector meson masses.

Contribution

It provides a detailed analysis of the quenched meson spectrum with improved extraction methods and correlation analysis, revealing notable deviations from experimental values.

Findings

Significant differences in pseudoscalar meson masses

Discrepancies in vector meson masses

Enhanced understanding of quenched QCD spectrum

Abstract

We analyse the meson spectrum in quenched QCD using lattice gauge theory. By studying hadron propagation with a variety of operators (both smeared and local), we are able to extract the ground state and first excited state masses with confidence. We pay attention to the correlations among the data used in the fits to extract these masses and couplings. We compare the resulting hadron spectrum with experiment and find evidence for a significant departure in the pseudoscalar and vector meson masses.