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This thesis has light mesons and their vacuum interactions as its topic. In particular, the work examines the question where the scalar antiquark-quark states are found in the physical spectrum -- in the energy region below or above 1 GeV. Contrary to the naive expectation, the mentioned states are found in the region above 1 GeV. This has consequences for the building of order parameters for the chiral symmetry breaking of Quantum Chromodynamics (QCD).