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{\bf Abstract Registration Number 532} \\
{\bf Parallel sessions: 3,5} \\
{\bf Plenary sessions: 5,7}
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\abstractheader{\bf Measurement of Internal Jet Structure in Dijet 
Production in Deep \\ Inelastic Scattering and Photoproduction at HERA \\
H1 Collaboration, DESY}

\abstractbody{
The internal structure of jets in dijet production in deep inelastic scattering
and in tagged photoproduction
is measured with the H1 detector at HERA.
In the kinematical region of squared momentum transfers of 
$10 < Q^2 \le 120\, \mbox{GeV}^2$ and $x$-Bjorken values of 
$2 \cdot 10^{-4} \le x_{Bj} \le 8 \cdot 10^{-3}$
jets with transverse energies of $E_{t,Breit} > 5\,\mbox{GeV}$ are
selected in the Breit frame employing $k_t$ and cone jet algorithms.
Measured observables are jet shapes and subjet multiplicities as a function 
of the resolution parameter.
Both observables are corrected for detector effects and presented as 
functions of the transverse jet energy and jet pseudorapidity.
The corrected data are well described by Monte Carlo models.
A dependence of the jet broadness and the average number of subjets
on the transverse energy and the pseudorapidity of the jet is observed.
With increasing transverse jet energies and decreasing pseudorapidities,
i.e. towards the photon hemisphere,
the jets are more collimated.
Furthermore the jets defined by the $k_t$ algorithm turn out to be 
narrower than jets defined by the cone algorithm.
Using the $k_t$ algorithm, measurement of subjet multiplicities
have also been performed in tagged photoproduction events.
They are presented as a function of the subjet resolution parameter
$y_{\rm cut}$ and the transverse energy and the pseudorapidity of the jets.
}

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