3 research outputs found
Influence of pressure on the relative population of the two lowest vibrational levels of the C 3 Πu state of nitrogen for electron beam excitation
Do Circumvention Tools Promote Democratic Values? Exploring the Correlates of Anti-Censorship Technology Adoption in China
Multi-Leptons with High Transverse Momentum at HERA
18 pages, 3 figures, revised version with small textual changesEvents 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