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{\bf EPS-HEP99} \\
{\bf Abstract \# 000} \\
{\bf Parallel sessions: 6,7} \\
{\bf Plenary sessions:  6,7,8}
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\abstractheader{ {\bf 
Search for events with an isolated high energy lepton and missing
transverse momentum at HERA  } \\ \\
H1 Collaboration, \\
DESY, Notkestr.85, D-22607 Hamburg, Germany
}

\abstractbody{
A search is performed for events with an imbalance in transverse
momentum and with an isolated high energy lepton in electron-proton
($e^-p$) 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 Reference for positron-proton scattering }\\
1. H1 Collaboration, C.~Adloff {\it et al}, 
DESY-98-063 / Eur. Phys. J. C 5 (1998) 4, 575-584 
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