Revisiting the line shape of $e^+e^-\to \jpsi η$ cross section

Chang-Man Gan, Jun-Kang He, Wen-Long Sang +1

We calculate the cross sections for the processes $e^+e^-\to \jpsi η$ and $e^+e^-\to \jpsi η^\prime$ at various CM energies $\sqrt{s}$. We first predict these cross sections by com…