Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-09-03
Eur.Phys.J.C32:453-473,2004
Physics
High Energy Physics
High Energy Physics - Experiment
42 pages, 15 figures, Submitted to Eur. Phys. J. C
Scientific paper
10.1140/epjc/s2003-01466-y
In total 1317 di-lepton events with significant missing transverse momentum were identified in a total data sample of 680 pb-1 collected at e+e- centre-of-mass energies ranging from 183 GeV to 209 GeV. The number of di-lepton events, the dependence on centre-of-mass energy, and the event properties are consistent with expectations from Standard Model processes, predominantly W+W- production with both W bosons decaying leptonically. This topology is also an experimental signature for the pair production of new particles that decay to a charged lepton accompanied by one or more invisible particles. No evidence for new phenomena is apparent. Upper limits are presented on the production cross-section multiplied by the relevant branching ratio squared for sleptons, leptonically decaying charginos and charged Higgs bosons. Mass limits are also given.
Abbiendi Giovanni
collaboration The OPAL
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