%
% 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 Measurement of Leading Proton and Neutron Production  \\
   in Deep Inelastic Scattering at HERA
}\\     [4mm]
%
{H1 Collaboration}\\                            
%
{\small \em DESY, Hamburg, Germany}\\[6mm]
%
Deep--inelastic scattering events with a leading baryon have been detected
by the H1 experiment at HERA using a forward proton spectrometer and a
forward neutron calorimeter. Semi--inclusive cross sections have been
measured in the kinematic region
$2 \le Q^2 \le 50$~{\rm GeV}$^2$, $6\cdot 10^{-5} \le x \le 6\cdot 10^{-3}$
and baryon $p_T \le 200$~{\rm MeV}, for events with a final state proton with
energy $580 \le E^{\prime} \le 740$~{\rm GeV}, or a neutron with energy
$E^{\prime} \ge 160$~{\rm GeV}. The measurements are used to test production
models and factorization hypotheses. A Regge model of leading baryon
production which consists of pion, pomeron and secondary reggeon exchanges
gives an acceptable description of both semi--inclusive cross sections
in the region $0.7 \le E^{\prime} / E_p \le 0.9$, where $E_p$ is the
proton beam energy. The leading neutron data are used to estimate for
the first time the structure function of the pion at small Bjorken--$x$.

\vspace*{0.5cm}

{\bf References }\\
1. H1 Collaboration, C.~Adloff {\it et al}, 
DESY-98-169 / submitted to Eur. Phys. J. C 

\end{document}