Scalar Mesons, Glueballs, Instantons and the Glueball/Sigma

Details Scalar Mesons, Glueballs, Instantons and the Glueball/Sigma Scalar Mesons, Glueballs, Instantons and the Glueball/Sigma

2001-06-14

arxiv.org/abs/hep-ph/0106158v1

Phys.Lett. B523 (2001) 127-134

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 4 figures

Scientific paper

10.1016/S0370-2693(01)01313-2

We include instanton effects in QCD sum rules for coupled scalar glueballs and mesons. We find a light glueball/sigma as in earlier studies without instantons, but in a lattice-type pure instanton model the light glueball/sigma is not found. In the 1-2 Gev region we now find that lightest I=0 meson, in the region of the f$_o$(1370), has no direct glueball mixing, with the instanton loop replacing the glueball component. The lightest scalar mainly glueball in the region of the f$_o$(1500) is sensitive to the choice of nonperturbative gluonic parameters.

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