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2002•AIP conference proceedingsOpen access

Light scalar meson spectrum

Wolfgang Ochs

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Abstract

We discuss the classification of the light scalar mesons with mass below 2 GeV into qq̄ nonets and glueballs. The information on production and decay of these states, in particular recent information on the f0(980), f0(400 – 1200) (or σ(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 qq̄ states spread over a similar mass range. We do not see sufficient evidence yet for a light scalar nonet below 1 GeV around a σ(600) resonance.

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We discuss the classification of the light scalar mesons with mass below 2 GeV into qq̄ nonets and glueballs. The information on production and decay of these states, in particular recent information on the f0(980), f0(400 – 1200) (or σ(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 qq̄ states spread over a similar mass range. We do not see sufficient evidence yet for a light scalar nonet below 1 GeV around a σ(600) resonance.

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Available abstract

We discuss the classification of the light scalar mesons with mass below 2 GeV into qq̄ nonets and glueballs. The information on production and decay of these states, in particular recent information on the f0(980), f0(400 – 1200) (or σ(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 qq̄ states spread over a similar mass range. We do not see sufficient evidence yet for a light scalar nonet below 1 GeV around a σ(600) resonance.

Key concepts: Glueball, Physics, Particle physics, Scalar (mathematics), Meson, Scalar meson, Resonance (particle physics), Mathematics

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