6 papers · 1 filter
Gaussian Sum-Rules, Scalar Gluonium, and Instantons
T. G. Steele, D. Harnett, G. Orlandini
Gaussian sum-rules relate a QCD prediction to a two-parameter Gaussian-weighted integral of a hadronic spectral function, providing a clear conceptual connection to quark-hadron du…
Two Topics in QCD Sum-Rules: Bounds on Light Quark and Scalar Gluonium Masses
T. G. Steele, D. Harnett
QCD Laplace sum-rules are briefly reviewed and two sum-rule applications are presented. For scalar gluonium, upper bounds on the lightest state are obtained from ratios of Laplace…
Probing the Infrared Structure of Gauge Theories: A Pade-Approximant Approach
F. A. Chishtie, V. Elias, V. A. Miransky +1
Pade-approximant treatments of the known terms of the QCD -function are seen to develop possible infrared fixed point structure only if the number of fermion flavours is suffici…
QCD Sum-Rule Invisibility of the sigma Meson
T. G. Steele, Fang Shi, V. Elias
QCD Laplace sum-rules for light-quark I=0,1 scalar currents are used to investigate candidates for the lightest scalar mesons. The theoretical predictions for the sum-rul…
Pade Approximants and the Fixed-Points of the three-flavour QCD beta-Function
V. Elias, T. G. Steele
The positive zeros of [2|1], [1|2] and the most general possible [2|2] Pade approximants whose Maclaurin series reproduce the presently known terms in the three-flavour QCD beta-fu…
QCD Laplace Sum Rules and the Resonance
T. G. Steele, J. C. Breckenridge, M. Benmerrouche +2
A global fit to the shape of the first QCD Laplace sum rule exhibiting sensitivity to pion-resonance [] parameters is performed, leading to predictions for the pion-resona…