Lattice calculation of the ${\eta }_c{\eta }_c$ and $J/\psi J/\psi$ s-wave scattering length

Yu Meng, Chuan Liu, Xin-Yu Tuo +2

We calculate the s-wave scattering length in the $0^{+}$ sector of ${\eta }_c{\eta }_c$ and the $2^{+}$ sector of $J/\psi J/\psi$ using three $N_f=2$ twisted mass gauge ensembles with the lattice spacing…