Quarkonium Spectroscopy: Beyond One-Gluon Exchange

Details Quarkonium Spectroscopy: Beyond One-Gluon Exchange Quarkonium Spectroscopy: Beyond One-Gluon Exchange

2007-07-09

arxiv.org/abs/0707.1269v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

94 pages, 38 figures, diploma thesis, TU Muenchen, Germany, Jan. 2007

Scientific paper

In this work an improved potential model for quarkonium spectra (charmonium, bottomonium) is constructed. Beside the one-gluon exchange and a linear confinement potential, the model includes systematically effects from two-gluon exchange and the induced interaction (i.e. t-channel exchanges of quark-antiquark bound states). These turn out to be important in order to reproduce correctly the fine- and hyperfine structure of the charmonium and bottomonium states. It is demonstrated that such a satisfactory description of the quarkonium spectra can be obtained with parameters (quark masses, strong coupling constant and string tension) consistent with values of lattice simulations and QCD determinations.

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