Multi-lepton events at HERA

Abstract

Events containing high-$P_T$ multi-leptons were sought at HERA by the H1 and ZEUS collaborations. Experimental data were compared to simulations of $\gamma \gamma \to l^{+}{l}^{-}$ processes, and H1 extracted the total and differential cross sections of the processes. The doubly-charged Higgs, which decays into lepton pairs, was analysed by H1 as a possible source of the multi-electron events, which have been observed at high invariant masses.

5 pages, 5 figures, published in the proceedings of 11th International Workshop on Deep Inelastic Scattering (DIS 2003), St. Petersburg, Russia, 23-27 Apr 2003