Multi-Electron Production at High Transverse Momenta in ep Collisions at HERA

Details Multi-Electron Production at High Transverse Momenta in ep Collisions at HERA Multi-Electron Production at High Transverse Momenta in ep Collisions at HERA

2003-07-07

arxiv.org/abs/hep-ex/0307015v1

Eur.Phys.J.C31:17-29,2003

Physics

High Energy Physics

High Energy Physics - Experiment

23 pages, 8 figures and 4 tables

Scientific paper

10.1140/epjc/s2003-01326-x

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, three di-electron events and three tri-electron events are observed, compared to Standard Model expectations of 0.30 \pm 0.04 and 0.23 \pm 0.04, respectively.

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