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%                         P H O T O N 9 9
%                          Freiburg
%                       May  23 - 27, 1999
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Abstract \#000, \today
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{\large \bf
\boldmath Test of QCD Dynamics at Small Parton Momenta $x$ at HERA
\\ }
\vspace{5mm}
M.~Erdmann$^1$
(for the H1 Collaboration)
\\
\vspace{5mm}
{\small\it
(1) University Karlsruhe / DESY, Notkestr. 85, D-22607 Hamburg, Germany
\\
}
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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 including one which makes use of the structure
of virtual photons.

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