Hybrid Charmonium and the $\rho -\pi$ Puzzle

Leonard S. Kisslinger, Diana Parno, Seamus Riordan

Using the method of QCD Sum Rules, we estimate the energy of the lowest hybrid Charmonium state, and find it to be at the energy of the ${\Psi }^{\prime }(2S)$ state, about 600 Mev above the $J/Ψ…