Light scalar meson spectrum
Abstract
We discuss the classification of the light scalar mesons with mass below 2 GeV into q qbar nonets and glueballs. The information on production and decay of these states, in particular recent information on f0(980), f0(400-1200) (or sigma(600)) and f0(1500) is considered. Although the data are not yet very precise the recent information is in favour of the previously developed scheme which includes f0(980), a0(980), K0*(1430), f0(1500) into the lightest scalar nonet. The glueball in this approach appears as broad object around 1 GeV. Alternative schemes find the glueball at somewhat higher mass or suggest his mixing with q qbar states spread over a similar mass range. We do not see sufficient evidence yet for a light scalar nonet below 1 GeV around a sigma(600) resonance.
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