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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,doi:10.3929/ethz-b-000052987 fatcat:hei3bfeunjg5xe3v75ok2w4ybm