14.07.15 16:00
XYZ states in BES-III
Wolfgang Gradl (Univ. Mainz)
The theory of the strong interaction, Quantum Chromodynamics, has been
probed very successfully up to very high energies, for example using
hadron production in electron-positron collisions. At low energy
scales, the QCD potential is non-perturbative and still not fully
understood. One approach to obtain deeper insight into the
non-perturbative regime of the strong interaction is the study of
charmonium spectroscopy. e+e- annihilation provides a very clean
environment to perform measurements of this kind.
A `second charm revolution' has been sparked with the discovery of new
'XYZ' states, such as the X(3872) or the Y(4260) by the B factories
Belle and BABAR, which do not fit into the conventional picture of
quark-antiquark bound systems. Recently, a number of further,
non-conventional bound states have been seen. In this talk, I will
concentrate on some of the more exotic bound states recently
discovered at BESIII, and show some of the connections between them
being made.