TL;DRAbstract
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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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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