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
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 
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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