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The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 5 Issue 4 (1998) pp 575-584
DOI 10.1007/s100529800973
experimental physics:
Observation of events with an isolated high energy lepton and missing transverse momentum at HERA
H1 Collaboration, C. Adloff et al. (34)
(34) Fachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, Germany
Received: 9 June 1998 / Published online: 26 August 1998
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 $\mu^{\pm}$ 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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Online publication: October 19, 1998
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