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D. Parganlija:
"Quarkonium Phenomenology in Vacuum";
Supervisor, Reviewer: D. Rischke, J. Schaffner-Bielich; Institut für Theoretische Physik, Frankfurt/Main U, 2012; oral examination: 2012-05-25.

Broad meson phenomenology in vacuum is discussed in a single model containing scalar, pseudoscalar, vector and axial-vector states both in the non-strange and strange sectors. Emphasis is given to search for quark-antiquark (quarkonium) states in the scalar and axial-vector channels. In particular, the work examines the question whether the scalar quark-antiquark states are found in the energy region below or above 1 GeV in the physical spectrum. Contrarily to the naive expectation, the mentioned states are found in the region above 1 GeV. Additionally, the axial-vector isotriplet state a1(1260) is described as a quarkonium. These results have consequences for the building of order parameters for the chiral-symmetry breaking of Quantum Chromodynamics (QCD).