2020 Impact factor 4.590
Particles and Fields

Eur. Phys. J. C 5, 575-584
DOI 10.1007/s100529800973

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

H1 Collaboration
C.Adloff34 - et al.

34 Fachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, Germany

Received: 9 June 1998 / Published online: 26 August 1998

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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