Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-11-09
Physics
High Energy Physics
High Energy Physics - Experiment
To appear in the proceedings of the 32nd International Conference on High-Energy Physics (ICHEP04), Beijing, China, 16-22 Aug
Scientific paper
Multi-electron and multi-muon production at high transverse momentum is measured in $ep$ scattering at HERA. Previous published analyses are extended, combining new HERA II data taken in 2003-2004 with previous HERA I data sample. In addition events with high $P_T$ electrons and muons are investigated here for the first time. Yields of di-lepton and tri-lepton events are measured and a general good agreement is found with the Standard Model prediction, dominated by photon-photon interactions. Events are observed with leptons of high transverse momenta in a domain where the Standard Model prediction is low.
for the H1 Collaboration
Sauvan Emmanuel
ZEUS Collaboration
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