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{\large\bf Search for events with an isolated high energy lepton and missing
transverse momentum at HERA
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{H1 Collaboration}\\                            
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{\small \em DESY, Hamburg, Germany}\\[6mm]
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A search is performed for events with an imbalance in transverse
momentum and with an isolated high energy lepton in $e^-p$ scattering
at HERA. The results are compared to those obtained from the $e^+p$
HERA run where one $e^-$ event and and five $\mu^\pm$ events were
found together with evidence for unseen particles carrying tranverse
momentum$^1$. 
Three of the six events were 
found in a region of phase space likely to be populated by
the production of $W$ bosons with subsequent leptonic decay. 
The remaining three events showed kinematic properties which are atypical of
all Standard Model processes considered.

\vspace*{0.5cm}
{\bf References }\\
1. H1 Collaboration, C.~Adloff {\it et al}, 
DESY-98-063 / Eur. Phys. J. C 5 (1998) 4, 575-584 
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