Production of $W^+ W^-$ and $t \bar t$ pairs via photon-photon processes in proton-proton scattering and corresponding gap survival factor

We review our recent results for production of $W^+ W^-$ and $t {\bar t}$ pairs via photon-photon fusion mechanism. A sketch of theoretical approach is presented. We include transverse momenta of photons in calculation of fluxes of photons. Then we present our results for $W^+ W^-$ production. Results for different parametrizations of proton structure functions are used to calculate inelastic fluxes of photons. A discussion on rapidity gap survival probability due to remnant fragmentation is presented. A similar discussion is presented for $t {\bar t}$ production.

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