Multi-Leptons with High Transverse Momentum at HERA

Details Multi-Leptons with High Transverse Momentum at HERA Multi-Leptons with High Transverse Momentum at HERA

2009-07-21

arxiv.org/abs/0907.3627v2

JHEP 0910:013,2009

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages, 3 figures, revised version with small textual changes

Scientific paper

10.1088/1126-6708/2009/10/013

Events with at least two high transverse momentum leptons (electrons or muons) are studied using the H1 and ZEUS detectors at HERA with an integrated luminosity of 0.94 fb^{-1}. The observed numbers of events are in general agreement with the Standard Model predictions. Seven di- and tri-lepton events are observed in e^+p collision data with a scalar sum of the lepton transverse momenta above 100 GeV while 1.94+-0.17 events are expected. Such events are not observed in e^-p collisions for which 1.19+-0.12 are predicted. Total visible and differential di-electron and di-muon photoproduction cross sections are extracted in a restricted phase space dominated by photon-photon collisions.

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