On semi-exclusive measurement of γγtoγγ scattering

The two-photon production of photon pairs, i.e. the $\gamma\gamma\to\gamma\gamma$ process, is studied. Different production modes regarding the elastic or inelastic coupling of the intermediate-state photons to the protons are considered. The semi-exclusive measurement, where one intact proton is registered by a dedicated forward proton detector, is discussed. As an example, the signal and background simulations are performed for the $\gamma\gamma\to\gamma\gamma$ process mediated by the hypothetical 750 GeV resonance.