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Eta-prime ---> eta pi pi decay as a probe of a possible lowest lying scalar nonet
We study the eta' to eta pi pi decay within an effective chiral Lagrangian approach in which the lowest lying scalar meson candidates sigma(560) and kappa(900) together with the f0(980) and a0(980)…
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Mechanism for a next-to-lowest lying scalar meson nonet
Recent work suggests the existence of a nonconventional lowest-lying scalar nonet containing the a{sub 0}(980). Then the a{sub 0}(1450) and also the K{sub 0}{sup *}(1430) are likely candidates to…
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Global aspects of the scalar meson puzzle
A generalized linear sigma model for low-energy QCD is employed to study the quark structure of eight low-lying scalar isomultiplets as well as eight low-lying pseudoscalar isomultiplets. The model,…
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Note on a Sigma Model Connection with Instanton Dynamics
It is well known that the instanton approach to QCD generates an effective term which looks like a three-flavor determinant of quark bilinears. This has the right behavior to explain the unusual mass…
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Chiral Lagrangian Treatment of the Scalar Mesons: an Overview
In this talk a brief overview of the chiral Lagrangian framework for scalar mesons of refs. [1, 2, 3, 4, 5, 6, 7, 8] together with several low energy processes that have been studied in this…
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Putative Light Scalar Nonet
We investigate the {open_quotes}family{close_quotes} relationship of a possible scalar nonet composed of the a{sub 0}(980), the f{sub 0}(980) and the {sigma} and {kappa} type states found in recent…
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Toy Model for Two Chiral Nonets
Motivated by the possibility that nonets of scalar mesons might be described as mixtures of ``two quark'' and ``four quark'' components, we further study a toy model in which corresponding chiral…
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Mass uncertainties of f 0 (600) and f 0 (1370) and their effects on determination of the quark and glueball admixtures of the I=0 scalar mesons
Within a nonlinear chiral Lagrangian framework, the correlations between the quark and glueball admixtures of the isosinglet scalar mesons below 2 GeV and the current large uncertainties on the…
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Evidence for a scalar ?(900) resonance in pK scattering
Motivated by the $1/N_c$ expansion, we study a simple model in which the pi-K scattering amplitude is the sum of a current-algebra contact term and resonance pole exchanges. This phenomenological…
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Optimal renormalization group improvement of the perturbative series for the e+ e- annihilation cross-section
Using renormalization-group methods, we derive differential equations for the all-orders summation of logarithmic corrections to the QCD series for R(s) = sigma(e^+ e^- --> hadrons)/sigma(e^+ e^- -->…
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