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

  • H1 Collaboration
  • C. Adloff et al.
Experimental physics


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.


Measurement Error Phase Space Transverse Momentum Leptonic Decay Kinematic Property 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • H1 Collaboration
  • C. Adloff et al.
    • 1
  1. 1. Fachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, Germany DE

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