Introduction to T quarkonium physics

An introduction to T quarkonium physics is given. After generalities, the potential model approach used in connection with the Schroedinger equation is presented. The next chapter is devoted to the T(nS) resonances which be below their OZI threshold (n <= 3), and which are also called closed b resonances. In particular the decay of these resonances into hadrons and also radiative transitions are discussed. The usefulness of dipole sum rules for quarkonia is shown. Some features of the T(4S) resonance (open b resonance) are investigated. As the T(4S) will predominantly decay into mesons containing the b flavor (they are the B mesons), the mass value of these mesons are discussed firstly. It is shown how the study of the properties of the B meson offers the possibility of testing weak interaction models. Finally, after a very brief survey of the experimental situation, some comments about B0/anti B0 mixing and CP violation are made