Mixing of scalar glueballs and flavour-singlet scalar mesons
UKQCD Collaboration: Craig McNeile, and Chris Michael
TL;DR
This paper investigates the mixing between scalar glueballs and flavour-singlet scalar mesons using lattice QCD, comparing quenched and dynamical quark results, and introduces improved methods for evaluating disconnected diagrams.
Contribution
It provides a detailed methodology for extracting hadronic mixing strengths and compares quenched and dynamical lattice results for scalar meson-glueball mixing.
Findings
Quantitative mixing strengths between scalar glueballs and mesons.
Comparison of quenched and dynamical lattice results.
Enhanced techniques for disconnected diagram evaluation.
Abstract
We discuss in detail the extraction of hadronic mixing strengths from lattice studies. We apply this to the mixing of a scalar glueball and a scalar meson in the quenched approximation. We also measure correlations appropriate for flavour-singlet scalar mesons using dynamical quark configurations from UKQCD. This enables us to compare the results from the quenched study of the mixing with the direct determination of the mixed spectrum. Improved methods of evaluating the disconnected quark diagrams are also presented.
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