Quarkonium Spectroscopy: Beyond One-Gluon Exchange
Abstract
Description
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.
94 pages, 38 figures, diploma thesis, TU Muenchen, Germany, Jan. 2007
94 pages, 38 figures, diploma thesis, TU Muenchen, Germany, Jan. 2007