Abstract:
We discuss photon-photon fusion mechanisms of dilepton production in proton-proton collisions with rapidity gap in the main detector and one forward proton in the forward proton detectors. This is relevant for the LHC measurements by ATLAS+AFP and CMS+TOTEM.
Transverse momenta of the intermediate photons are included and photon fluxes are expressed in terms ofproton electromagnetic form factors and structure functions. Differential distributions in $\xi_{1/2}$, $M_{ll}$, $Y_{ll}$, $p_{t,ll}$, $M_R$ are shown and the competition of different mechanisms is discussed. Both double-elastic and single-dissociative processes are included in the analysis. Different parametrizations of the structure functions are used.
We discuss also mechanism with one forward $\Delta^+$ isobar, or other proton resonance in the final state. The role of several cuts is studied.
Important: This seminar is remote only due to the COVID-19 regulations