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HK: Fachverband Physik der Hadronen und Kerne
HK 58: Hadronenstruktur und -spektroskopie IX
HK 58.2: Talk
Thursday, March 24, 2011, 17:00–17:15, C-2
The Glueball in a Chiral Linear Sigma Model with Vector Mesons — •Stanislaus Janowski1, Denis Parganlija1, Francesco Giacosa1, and Dirk H. Rischke1,2 — 1Institut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Str. 1, D–60438 Frankfurt am Main — 2Frankfurt Institute for Advanced Studies, Goethe-Universität, Ruth-Moufang-Str. 1, D–60438 Frankfurt am Main
We present a two-flavour linear sigma model with global chiral symmetry and (axial-)vector mesons as well as an additional glueball degree of freedom. We consider the structure of the well-established resonances f0(1370) and f0(1500) by studying the mixing between the pure qq and the pure glueball state in the JPC=0++ channel. This allows us to determine the dominant contribution to the structure of these two resonances - we find f0(1370) to be predominantly a qq state and f0(1500) to be predominantly a glueball state. Additionally, we also consider the decay channels of f0(1370) and f0(1500) and compare our results with experimental data in order to ascertain the correctness of the results obtained about the structure of these resonances. As a by-product of our analysis, the gluon condensate is determined.