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\begin{document}

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\begin{titlepage}

\noindent

\begin{center}
  \Large
  {\bf 
     Measurements of Forward Jet Production at low x in DIS
}

  \vspace*{1cm}
    {\Large H1 Collaboration} 
\end{center}

\begin{abstract}

\noindent

New parton dynamics, characterized by an initial state cascade which 
is non-ordered in parton virtuality, are expected to become important in 
the kinematic region of small Bjorken-$x$ ($\xbj$)
in $ep$ scattering at HERA. Evidence for this feature 
of QCD is searched for by studying events
with a forward jet produced close 
to the direction of the outgoing proton beam in the angular range 
$7^o < \theta_{jet} < 20^o$. The cross section for inclusive forward jet
production is presented as a function of $\xbj$. The energy flow around the 
forward jet has been studied in different rapidity regions to investigate how 
the energy compensation is described by models and whether the forward jet 
profile changes with rapidity. With the present statistics it is possible 
to measure the  triple differential cross section
$\frac{d^3 \sigma}{dx\, dQ^2\, d\ptjet^2}$, which covers the phase space 
region dominated by direct photon interactions ($Q^2\gg \ptjet^2$), as 
well as the two scale `BFKL' region ($Q^2 \sim \ptjet^2$) and the 
`resolved virtual photon' region ($Q^2 \ll \ptjet^2$). In addition, 
events are studied with a hard central di-jet system in addition to the  
forward jet and the cross section for such topologies is measured as a 
function of the rapidity separation between the forward jet and
the two hard jets. The measurements are compared with the predictions of 
models generating initial state emissions which are ordered and non-ordered 
in virtuality. 

\end{abstract}

\end{titlepage}

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\begin{figure}[htb]
  \begin{center} 
    \epsfig{figure=H1prelim-04-033.fig1a.eps,height=8cm} 
    \caption{{\it      
        Inclusive forward jet cross-section (1997 data) as a function of $x_{Bj}$
        compared to NLO di-jet calculations (DISENT). The average transverse momentum
        squared of the forward jet in all events has been used as the re-normalization
        scale, $\mu^2_r$. The scale uncertainty (yellow band) is calculated by varying
        $\mu^2_r$ by a factor of 4. The lower limit in $x_{Bj}$ is $10^{-4}$.
    \label{fjxsecnlo}}}
  \end{center}
\end{figure}
\begin{figure}[htb]
  \begin{center} 
    \epsfig{figure=H1prelim-04-033.fig1b.eps,height=8cm} 
    \caption{{\it  
        Inclusive forward jet cross-section as a function of $x_{Bj}$ compared to
        QCD-based models. For \CASCADE~the version called J2003-set-2 has been used. The
        lower limit in $x_{Bj}$ is $10^{-4}$.
    \label{fjxsecqcd}}}
  \end{center}
\end{figure}


\begin{figure}[htb]
  \begin{center} 
    \epsfig{figure=H1prelim-04-033.fig2a.eps,height=16cm} 
    \caption{{\it  
        The triple differential forward jet cross-section as a function of $x_{Bj}$ in
        bins of $p^2_t$ of the forward jet and $Q^2$. The cross-section is compared to NLO di-jet calculations.
    \label{fjxp2q2nlo}}}
  \end{center}
\end{figure}
\begin{figure}[htb]
  \begin{center} 
    \epsfig{figure=H1prelim-04-033.fig2b.eps,height=16cm} 
    \caption{{\it  
        The triple differential forward jet cross-section as a function of $x_{Bj}$ in
        bins of $p^2_t$ of the forward jet and $Q^2$. The cross-section is compared to QCD-based
        models.
    \label{fjxp2q2qcd}}}
  \end{center}
\end{figure}

\begin{figure}[htb]
  \begin{center} 
    \epsfig{figure=H1prelim-04-033.fig3a.eps,height=8cm} 
    \epsfig{figure=H1prelim-04-033.fig3b.eps,height=8cm} 
    \caption{{\it  
        The cross-section for the production of forward jets in association with an additional hard dijet system in the central region. The cross section is
measured as a function of $\Delta\eta_2$ for
$\Delta\eta_1 < 1$ and $\Delta\eta_1 > 1$ , where $\Delta\eta_1$ is the 
pseudorapidity separation between the two jets in the central region and 
$\Delta\eta_2$ is the pseudorapidity separation between the forward jet and 
the more forward central jet. The cross-section is compared to QCD-based 
models.
    \label{2pfwdxsec}}}
  \end{center}
\end{figure}


\begin{figure}[htb]
  \begin{center} 
    \epsfig{figure=H1prelim-04-033.fig4a-1.eps,height=5.5cm} 
    \epsfig{figure=H1prelim-04-033.fig4a-2.eps,height=5.5cm} 
    \epsfig{figure=H1prelim-04-033.fig4a-3.eps,height=5.5cm}\\ 
    \epsfig{figure=H1prelim-04-033.fig4a-4.eps,height=5.5cm} 
    \epsfig{figure=H1prelim-04-033.fig4a-5.eps,height=5.5cm} 
    \epsfig{figure=H1prelim-04-033.fig4a-6.eps,height=5.5cm} 
    \caption{{\it  
Observed jet profiles at the hadron level as a function of the pseudorapidity
distance $\Delta \eta$ from the forward jet axis, shown in bins of the 
forward jet pseudorapidity. The jet profiles are based on the transverse
energy within one unit of azimuth from the jet axis. The results are compared 
to QCD-based models.
    \label{jetprofeta}}}
  \end{center}
\end{figure}

\begin{figure}[htb]
  \begin{center} 
    \epsfig{figure=H1prelim-04-033.fig4b-1.eps,height=5.5cm} 
    \epsfig{figure=H1prelim-04-033.fig4b-2.eps,height=5.5cm} 
    \epsfig{figure=H1prelim-04-033.fig4b-3.eps,height=5.5cm}\\
    \epsfig{figure=H1prelim-04-033.fig4b-4.eps,height=5.5cm} 
    \epsfig{figure=H1prelim-04-033.fig4b-5.eps,height=5.5cm} 
    \epsfig{figure=H1prelim-04-033.fig4b-6.eps,height=5.5cm} 
    \caption{{\it 
Observed jet profiles at the hadron level as a function of the azimuthal 
distance $\Delta \phi$ from the forward jet axis, shown in bins of the 
forward jet pseudorapidity. The jet profiles are based on the transverse
energy within one unit of pseudorapidity from the jet axis.
The results are compared to QCD-based models.
    \label{jetprofphi}}}
  \end{center}
\end{figure}


\end{document}

