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A search for events with an imbalance in transverse momentum and withisolated high energy leptons has been carried out at the positron-protoncollider HERA. One event with an e^- and five events with a mu^+- are foundtogether with evidence for undetected particles carrying transverse momentum.Within the Standard Model the dominant origin of events with this kind oftopology is the production of W bosons with subsequent leptonic decay. Three ofthe six events are within measurement errors found in a region of phase spacelikely to be populated by this process, while the remaining events showkinematic properties which are atypical of all Standard Model processesconsidered.

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