Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-04-22
Nucl.Phys. A728 (2003) 165-181
Physics
High Energy Physics
High Energy Physics - Phenomenology
latex, using elsart style and amsmath, 17 pages, 6 eps figures included in manuscript. Revised version includes an extra figur
Scientific paper
Instanton effects and three-loop perturbative contributions are incorporated into QCD sum-rule analyses of pseudoscalar ($J^{PC}=0^{-+}$) gluonium. Gaussian sum-rules are shown to be superior to Laplace sum-rules in optimized predictions for pseudoscalar gluonium states in the presence of instanton contributions. The Gaussian sum-rule analysis yields a pseudoscalar mass of $(2.65\pm 0.33) GeV$ and width bounded by $\Gamma<530 MeV$. The Laplace sum-rules provide corroborating evidence in support of the $\approx 2.7 GeV$ mass scale.
Zhang Ailin
~Steele ~G. T.
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