Quarkmodells of Hadrons

The explanation of the properties and interactions of hadrons in terms of their internal quark structure is a challenging subject in particle physics. Although the non-relativistic constituent quark model (meson as quark-antiquark bound states, baryons as three quark states) can successfully explain the hadron spectra, it fails for strongly bound states such as the pion as well as in the calculation of processes at high momentum transfer. We therefore constructed a relativistically covariant quark model for mesons on the basis of the Bethe-Salpeter Equation. In this framework electroweak decays and form factors are computed and compared to experimental data.

This model was extended to the description of baryonswith light and heavy flavours. In addition, tools to compute static properties, such as charge radii and magnetic moments and (transition) form factors for baryons from Bethe-Salpeter Amplitudes were developed. Also strong two-body decay amplitudes have been calculated.