Exotic vector charmonium and its leptonic decay width

Ying Chen, Wei-Feng Chiu, Ming Gong, Long-Cheng Gui, Zhao-Feng Liu
2016 Chinese Physics C, High Energy Physics & Nuclear Physics  
We propose a novel type of interpolating field operators, which manifests the hybrid-like configuration that the charm quark-antiquark pair recoils against gluonic degrees of freedom. A heavy vector charmonium-like state with a mass of 4.33(2) GeV is disentangled from the conventional charmonium states in the quenched approximation. This state has affinity for the hybrid-like operators but couples less to the relevant quark bilinear operator. We also try to extract its leptonic decay constant
more » ... d give a tentative upper limit that it is less than one tenth of that of J/ψ, which corresponds to a leptonic decay width about dozens of eV. The connection of this state with X(4260) is also discussed.
doi:10.1088/1674-1137/40/8/081002 fatcat:6gcq6ppz7fgdtd6bbvnx75ati4