Multi-electron production at high transverse momenta in ep collisions at HERA

H1 Collaboration, A. Aktas, S. Baumgartner, Wolfram Erdmann, Christoph Grab, Benno List, Salvatore Mangano, David Meer, A. Schöning, R. Weber, Et Al.
2003
Multi-electron production is studied at high electron transverse momentum in positron-and electron-proton collisions using the H1 detector at HERA. The data correspond to an integrated luminosity of 115 pb −1 . Di-electron and tri-electron event yields are measured. Cross sections are derived in a restricted phase space region dominated by photon-photon collisions. In general good agreement is found with the Standard Model predictions. However, for electron pair invariant masses above 100 GeV,
more » ... ses above 100 GeV, three di-electron events and three tri-electron events are observed, compared to Standard Model expectations of 0.30 ± 0.04 and 0.23 ± 0.04, respectively.
doi:10.3929/ethz-b-000052987 fatcat:hei3bfeunjg5xe3v75ok2w4ybm