Abstract
A search for exclusive or semi-exclusive production, pp → p(*) +γ γ+p(*) (where p* stands for a diffractively- dissociated proton), and the observation of exclusive and semi-exclusive e +e- production, pp → p(*) + e+e - + p(*), in proton-proton collisions at √s = 7TeV, are presented. The analysis is based on a data sample corresponding to an integrated luminosity of 36 pb-1 recorded by the CMS experiment at the LHC at low instantaneous luminosities. Candidate γ γor e+e - events are selected by requiring the presence of two photons or a positron and an electron, each with transverse energy ET > 5.5 GeV and pseudorapidity |η| < 2.5, and no other particles in the region |η| < 5.2. No exclusive or semi-exclusive diphoton candidates are found in the data. An upper limit on the cross section for the reaction pp → p(*) +γ γ+ p(*), within the above kinematic selections, is set at 1.18 pb at 95% confidence level. Seventeen exclusive or semi-exclusive dielectron candidates are observed, with an estimated background of 0.85 ± 0.28 (stat.) events, in agreement with the QED-based prediction of 16.3 ± 1.3 (syst.) events.
Original language | English (US) |
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Article number | 80 |
Journal | Journal of High Energy Physics |
Volume | 2012 |
Issue number | 11 |
DOIs | |
State | Published - 2012 |
Bibliographical note
Funding Information:The authors thank A. P. Tomsia for helpful discussions. This work has been supported by CICYT, Spain under project number MAT97-0724. Jos6 F. Bartolome was supported by the Consejeria de Educacion Cultura de la Comunidad de Madrid, Spain.
Keywords
- Hadron-Hadron Scattering