%
% Simple template for an abstract of a contributed paper, 
% PANIC99, Uppsala, Sweden, June 10-16, 1999
%
\documentstyle[epsfig,graphicx,12pt]{article}
%
\setlength{\textwidth}{160mm}\setlength{\textheight}{240mm}
\setlength{\oddsidemargin}{0mm}\setlength{\evensidemargin}{0mm}
\setlength{\topmargin}{0mm}
\setlength{\parindent}{0mm} 
\pagestyle{empty}       %no page number!
%
\begin{document}
%
{\large\bf\boldmath A study  of event shape variables in deep-inelastic $ep$ 
scattering at HERA.
}\\     [4mm]
%
{H1 Collaboration}\\                            
%
{\small \em DESY, Hamburg, Germany}\\[6mm]
%
Deep-inelastic $ep$ scattering data, taken with the H1 detector at HERA,
are used to study in the Breit-frame the event shape variables thrust, jet
broadening,
jet mass, $C$~parameter and two kinds of differential two-jet rates
over a large range of four-momentum transfer $Q$ between
$7\,{\rm GeV}$ and $100\,{\rm GeV}$. \\
Second order calculations of perturbative QCD are fitted to
the $Q$ dependence of the mean values, applying power law 
corrections proportional to $1/Q^p$
to account for hadronization effects. The concept of these power corrections
is tested by a systematic investigation in terms of a non-perturbative
parameter $\overline{\alpha}_{p-1}$ and the strong coupling constant.

\end{document}

