Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-06-08
Phys.Lett.B680:13-23,2009
Physics
High Energy Physics
High Energy Physics - Experiment
18 pages, 5 figures. v2: revised version for journal publication
Scientific paper
10.1016/j.physletb.2009.08.026
A search for events containing two or more high-transverse-momentum isolated leptons has been performed in ep collisions with the ZEUS detector at HERA using the full collected data sample, corresponding to an integrated luminosity of 480 pb^{-1}. The number of observed events has been compared with the prediction from the Standard Model, searching for possible deviations, especially for multi-lepton events with invariant mass larger than 100 GeV. Good agreement with the Standard Model has been observed. Total and differential cross sections for di-lepton production have been measured in a restricted phase space dominated by photon-photon collisions.
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