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%===============================title page=============================
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\begin{document}
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\begin{center}
\mbox{}
\vspace{0.4cm}

\begin{Large}
{\bf
Three-Jet Production in Deep-Inelastic Scattering \\ at HERA 
}
\vspace{1.2cm}

H1 Collaboration --- preliminary results for DIS 2001

\end{Large}
\end{center}
 
\vspace{1cm}



% **********************************************************************
% ***** Figure 1
%
\begin{figure}[h!]
\caption{A sketch of the angles $\theta_3$  and $\psi_3$ which 
are defined by the momenta $\vec{p}_3$, $\vec{p}_4$, $\vec{p}_5$ 
of the three jets and the proton beam ($\vec{p}_B$) 
in the three-jet center of mass frame.}
\label{fig:graph}
\end{figure}

% **********************************************************************
% ***** new Figure 2
\begin{figure}[h!]
\caption{The inclusive three-jet cross section (a) measured as 
a function of the four-momentum transfer squared $Q^2$.
The predictions of perturbative QCD 
in leading order (dotted line) and in next-to-leading order 
with (solid line) and without hadronization corrections 
(dashed line) are compared to the data.
Also shown is the ratio of the measured cross section and the
theoretical prediction, including the effects from variations
of $\alpha_s(M_Z)$, the renormalization scale $\mu_r$ and
the gluon density in the proton.
The ratio $R_{3/2}$ of the inclusive three-jet cross section
to the inclusive dijet cross section (b) is 
compared to the next-to-leading order calculation
including hadronization corrections (dotted line).
The sensitivity of the calculation to parameter variations
is indicated as in (a).
}
\end{figure}

% **********************************************************************
% ***** new Figure 3
\begin{figure}[h!]
\caption{The inclusive three-jet cross section measured
as a function  of (a) the Bjorken scaling variable $\Xbj$ 
and (b) the invariant three-jet mass $\Mthree$.
The predictions of perturbative QCD 
in leading order (dotted line) and next-to-leading order (solid line) 
with hadronization corrections are compared to the data.
}
\end{figure}
% **********************************************************************
% ***** new Figure 4
\begin{figure}[h!]
\caption{The distributions of the jet energy fractions
$X_3$ (top) and $X_4$ (bottom)
in the three-jet center-of-mass frame at low $Q^2$ (left)
and high $Q^2$ (right).
The data are compared to the predictions of perturbative QCD 
in next-to-leading order (solid line)
and to a three-jet phase space model (dotted line).
}
\end{figure}
% **********************************************************************
% ***** new Figure 5
\begin{figure}[h!]
\caption{Distributions of $\cos \theta_3$ (top) and the angle
$\psi_3$ (bottom) in the three-jet center-of-mass frame
at low $Q^2$ (left) and high $Q^2$ (right).
The data are compared to the predictions of perturbative QCD 
in next-to-leading order (solid line)
and to a three-jet phase space model (dotted line).}
\end{figure}

\end{document}

