Charmonium Charged States

Abstract

Some of the new charged chamonium states are studied using QCD sum rules. It is found that a tetraquark interpretation can be used to explain the masses and decay widths of these states.

Modeling two-boson mass distributions, E(38 MeV) and Z(57.5 GeV)

“…Its mass is given by the mass of the seed and a hadronic shift, whereas its width is determined by all the open and closed strong two-boson channels. As long as the open candidates are not yet looked for in experiment, one may prematurely conclude that the signal stems from an exotic quark system [12]. However, only a full inspection of all of the many possible strong decay channels for the corresponding cs system can resolve this and, since the various cū + us, c d + ds and cs + ss two-boson channels and their excitations couple very weakly to the sixth or seventh radial excitation of the cs system, that may need some statistics.…”