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Observation of events with an isolated high energy lepton and missing transverse momentum at HERA

Authors
Journal
The European Physical Journal C
1434-6044
Publisher
Springer-Verlag
Publication Date
Volume
5
Issue
4
Identifiers
DOI: 10.1007/s100520050302

Abstract

A search for events with an imbalance in transverse momentum and with isolated high energy leptons has been carried out at the positron-proton collider HERA. One event with an e and five events with a μ are found together with evidence for undetected particles carrying transverse momentum. Within the Standard Model the dominant origin of events with this kind of topology is the production of W bosons with subsequent leptonic decay. Three of the six events are within measurement errors found in a region of phase space likely to be populated by this process, while the remaining events show kinematic properties which are atypical of all Standard Model processes considered.

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