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{\bf EPS-HEP99} \\
{\bf Abstract \# 000} \\
{\bf Parallel sessions: 1,6} \\
{\bf Plenary sessions:  1,6}
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\abstractheader{ {\bf 
\boldmath Test of the Standard Model in high $E_T$ jet production at HERA  } \\ \\
H1 Collaboration, \\
DESY, Notkestr.85, D-22607 Hamburg, Germany
}

\abstractbody{
Following the observation$^1$ by H1 of unexpected events with jets, 
high $P_T$ leptons and missing transverse momentum, we explore final states 
with similar kinematic configurations but only high $E_T$ in the final state.
The data sample comprises all available $e^+p$ data as well as, for the first
time, also $e^-p$ data collected in 1998 and 1999.
The measured event rate is compared with QCD and electroweak production 
mechanisms for multijet events, and constraints on novel production 
mechanisms are derived.
}

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{\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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