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{\bf EPS-HEP99} \\
{\bf Abstract \# 000} \\
{\bf Parallel sessions: 1,3} \\
{\bf Plenary sessions:  1,3}
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\abstractheader{ {\bf  
\boldmath Test of QCD Dynamics at Small Parton Momenta $x$ at HERA } \\ \\
H1 Collaboration, \\
DESY, Notkestr.85, D-22607 Hamburg, Germany
}

\abstractbody{
The production of high transverse momentum $\pi^0$'s and
charged particles is studied in deep inelastic positron-proton scattering
data taken with the H1 detector at the $ep$ collider HERA. The rate of
 particles observed at small angles with respect to the initial proton
direction is strongly correlated to the underlying parton dynamics.
Results are
presented as a function of Bjorken-$x$ and $x_i$, the fraction of the
incident proton's energy carried by the particle. The data are
analysed in a region of low Bjorken-$x$ and large $x_i$ and are compared
with the predictions of BFKL calculations at leading order and with QCD
based  Monte Carlo models.
}

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