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A search for exclusive or semi-exclusive photon pair production, pp to p(*) +photon pair + p(*) (where p(*) stands for a diffractively-dissociated proton),and the observation of exclusive and semi-exclusive electron pair production,pp to p(*) + ee + p(*), in proton-proton collisions at sqrt(s) = 7 TeV, arepresented. The analysis is based on a data sample corresponding to anintegrated luminosity of 36 inverse picobarns recorded by the CMS experiment atthe LHC at low instantaneous luminosities. Candidate photon pair or electronpair events are selected by requiring the presence of two photons or a positronand an electron, each with transverse energy ET > 5.5 GeV and pseudorapidityabs(eta) < 2.5, and no other particles in the region abs(eta) < 5.2. Noexclusive or semi-exclusive diphoton candidates are found in the data. An upperlimit on the cross section for the reaction pp to p(*) + photon pair + p(*),within the above kinematic selections, is set at 1.18 pb at 95% confidencelevel. Seventeen exclusive or semi-exclusive dielectron candidates areobserved, with an estimated background of 0.85 +/- 0.28 (stat.) events, inagreement with the QED-based prediction of 16.3 +/- 1.3 (syst.) events.

the journal of high energy physics/the journal of high energy physics

Search for exclusive or semi-exclusive photon pair production and  observation of exclusive and semi-exclusive electron pair production in pp  collisions at sqrt(s) = 7 TeV