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%                         P H O T O N 9 9
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%                       May  23 - 27, 1999
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Abstract \#000, \today
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{\large \bf
Search for events with an isolated high energy lepton and missing
transverse momentum at HERA
\\ }
\vspace{5mm}
M.~Erdmann$^1$
(for the H1 Collaboration)
\\
\vspace{5mm}
{\small\it
(1) University Karlsruhe / DESY, Notkestr. 85, D-22607 Hamburg, Germany
\\
}
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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.


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{\small\begin{description}
\item{[1]}
H1 Collaboration, C.Adloff et al., \\
DESY-98-063 / Eur. Phys. J. C 5 (1998) 4, 575-584 
\end{description}}

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