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Multi-leptons with high transverse momentum at HERA

The H1 and ZEUS collaborations



Events with at least two high transverse momentum leptons (electrons or muons) are studied using the H1 and ZEUS detectors at HERA with an integrated luminosity of 0.94 fb−1. The observed numbers of events are in general agreement with the Standard Model predictions. Seven di- and tri-lepton events are observed in e+p collision data with a scalar sum of the lepton transverse momenta above 100 GeV while 1.94±0.17 events are expected. Such events are not observed in ep collisions for which 1.19±0.12 are predicted. Total visible and differential di-electron and di-muon photoproduction cross sections are extracted in a restricted phase space dominated by photon-photon collisions.

Keywords

Lepton-Nucleon Scattering

PACS

13.60.Hb Total and inclusive cross sections (including deep-inelastic processes)

12.20.Ds Specific calculations

14.60.Ef Muons

12.10.-g Unified field theories and models

Subjects

Particle physics and field theory

Dates

Issue 10 (October 2009)

Received 22 July 2009, accepted for publication 20 September 2009

Published 5 October 2009



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