Two-photon exclusive production of supersym- metric pairs at the LHC

DOI: will be assigned The two-photon production of charged supersymmetric pairs at the LHC has a unique signature of two leptons, large missing energy and two forward scattered protons. For low-mass supersymmetric scenario, signicant cross{sections are predicted for the MSSM. Proton kinematics information from the VFD would allow for a precise mass reconstruction of right-handed sleptons and the LSP. For high luminosity runs, the probability to have accidental coincidence within central and very forward detectors increases although it can be reduced applying exclusivity conditions. 1 physics at the LHC In addition to the usual parton-parton interactions, a signicant fraction of the pp collisions at the LHC will also involve photon-interactions. The available relative luminosity reaches 1 % for W> 23 GeV and still 0.1 % for W > 225 GeV [1]. Among the whole photon interactions at the LHC, the study of pair production of charged particles, including supersymmetric particles, is one of the most interesting case since the QCD background is suppressed. The exclusive two-photon interactions at the LHC provides clean detection conditions thanks to striking experimental signature in absence of proton remnants: two very forward scattered protons, remained intact after photon-exchange, and large rapidity gaps in the forward regions due to the exchange of colorless object. 2 Detection of exclusive supersymmetric pairs In collisions, the production and decay mechanisms for low mass supersymmetry are simple and without decay chain problems. Also two-photon pair productions of left- and right-handed sleptons (~e+L, ~ L, ~