The all-charm tetraquark and its contribution to two-photon processes

Panagiotis Kalamidas, Marc Vanderhaeghen

Prompted by several potential tetraquark states that have been reported by the LHCb, CMS and ATLAS collaborations in the di-$J/\Psi$ and $J/\Psi \Psi (2S)$ spectra, we investigate their contr…