Very broad X(4260) and the resonance parameters of the ψ(3D) vector charmonium state.
We argue that the X(4260) enhancement contains a wealth of information on 1-- cc spectroscopy. We discuss the shape of the X(4260) observed in the Okubo-Zweig-Iizuka-forbidden process e+e-→π+π-J/ψ, in particular, at and near vector charmonium resonances as well as open-charm threshold enhancements. The resulting very broad X(4260) structure does not seem to classify itself as a 1-- cc resonance, but its detailed shape allows us to identify new vector charmonium states with higher statistics than in open-charm decay. Here, we estimate the resonance parameters of the ψ(3D). Our approach also provides an explanation for the odd dip in the π+π-J/ψ data precisely at the ψ(4415) resonance.
van Beveren
Eef
E
Centro de Física Teórica, Departamento de Física, Universidade de Coimbra, P-3004-516 Coimbra, Portugal. eef@teor.fis.uc.pt
Rupp
George
G
Segovia
J
J