Multi-lepton production in ep collisions at HERA

✍ Scribed by B. Leissner

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 517 KB
• Volume: 126
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(03)02323-5

✦ Synopsis

Multi-lepton events containing at least two electrons or two muons are studied in ep scattering at HERA using HERA I data samples at centre of mass energies of 6 = 301 GeV and fi = 319 GeV and corresponding to integrated luminosities of 115 pb-' (Hl) and 130 pb-' (ZEUS). Cross sections are derived from Hl data samples for the production of di-muons at 6 = 319 GeV and for electron pair production.

In di-and tri-lepton events, mass distributions are studied. High-mass multi-electron events are observed in a region where the Standard Model prediction is smaller.

A possible interpretation of this excess in terms of doubly charged Higgs boson production is ruled out.