Relativistische Beschreibung von Hadronen im Quarkmodell

During last several years a significant experimental progress has been
achieved due to the excellent operation of various facilities both at
e+e- colliders (Belle at KEKB, BaBar at SLAC, Cleo at CESR, BES at
BEPC) and at pbar p collider (CDF, D0, FOCUS, SELEX at Fermilab).
Numerous new hadrons were found which were long-awaited and searched
including several anomalous states which cannot be easily accommodated in
the simple qbar q and qqq picture of meson and baryons. These states
can be considered as the first candidates for exotic multiquark
(tetraquark etc.) states, glueballs and hybrids which are predicted to
exist in quantum chromodynamics. Many experimental regularities in the
hadron spectra and decay patterns were revealed which still await
theoretical interpretation. The Large Hadron Collider (LHC) at
CERN will provide experimenters with a new powerful tool to
test current theoretical approaches and to search for New Physics at
very high energies. However a significant theoretical guidance will be
needed to enable an effective extraction of new important physical
information from the vast data emerging in hadron collisions at very high
energies. Several other planned facilities (PANDA at FAIR, International
Linear Collider etc.) will also significantly contribute to this field.
Therefore a universal theoretical description of various heavy and light
hadron (mesons, baryons and exotic multiquark and hybrid states)
properties is a very important and actual problem. This project is aimed
on providing such a description in the framework of the QCD-based
relativistic quark model. The proposed investigation will allow to test
the relativistic quark dynamics in hadrons and on this basis to get an
important insight in the quark interaction over a wide range of interquark
distances. The planned project, in particular, includes the following main
problems. Development of a consistent unified treatment of heavy,
heavy-light and light mesons, baryons and tetraquarks. Special
attention will be devoted to the description of light scalars;
properties of both quark-antiquark and tetraquark states will be
studied. Determination of masses of highly excited states of
heavy baryons will be given and on this basis investigation of the Regge
trajectories will be performed. Baryons will be considered in the
relativistic quark-diquark picture with confining interaction and taking
into account the internal structure of diquarks. The results of the
project will be important for analysing experimental data, planning new
experiments and providing a deeper dynamical understanding of higher
hadronic excitations and new exotic multiquark states.