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Abstract
A number of bound states of the strong interaction with potential non-q q̄ nature are waiting to be understood within QCD. A prominent example are the light scalars with JPC = 0++, which have been interpreted as tetraquarks already long ago. Recent four-body calculations in the Dyson-Schwinger/Bethe-Salpeter approach support the tetraquark hypothesis and find the σ meson to have a strong pion-pion component.
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1 Institut für Theoretische Physik, Justus-Liebig Universität Gießen, 35392 Gießen, Germany
2 CFTP, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal