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\section*{Foreword}
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The international workshop entitled {\it New Trends in HERA Physics 2003} took
place from 28 September to 3 October 2003 at Ringberg Castle, which overlooks
Lake Tegernsee in the foothills of the Bavarian Alps, one of the most
picturesque locations to be found in the whole of Germany.
The castle was built during the first half of the twentieth century by Duke
Luitpold in Bavaria (Herzog Luitpold in Bayern), a member of the Wittelsbach
family which ruled Bavaria over 800 years, and his friend Friedrich
Attenhuber, an all-round artist, architect, and interior decorator.
The castle is entirely their creation, from the massive Renaissance-inspired
exterior right down to the fittings and furniture, which, in every detail,
were designed by Attenhuber himself and executed by native craftsmen.
Attenhuber also painted every single picture exhibited in the castle.
He found his models in the farmhouses around Lake Tegernsee.
The castle embodies all trends of art and styles which dominated the first
half of last century, combined with local Alpine originality and the
individual creative power of its constructors. 
According to the Duke's last will, the castle passed into the hands of the
Max Planck Society after his death, in 1973.
The castle was then transformed into a conference venue, where scientists can
exchange their latest ideas and discuss problems with their colleagues from
all over the world in beautiful surroundings and in a relaxed mountain
atmosphere, high above the daily business activities.

This was the fourth event in a series of Ringberg workshops on HERA physics,
which was started in 1997 and was continued in 1999 and 2001.
In fact, at the end of these workshops, many participants expressed the
opinion that this was a successful endeavour to bring theorists and
experimentalists together in order to interpret the latest HERA data, and that
it would be useful to organize a follow-up workshop in the same spirit.

On the occasion of the 2003 Ringberg workshop, forty-one experts of
elementary-particle physics, both theorists and experimentalists, from
twenty-three universities and research institutions in fourteen countries
congregated to present their latest results on the various aspects of HERA
physics.
Specifically, there were sixteen theorists and twenty-five experimentalists,
the latter representing the H1, HERMES, and ZEUS collaborations at HERA.
The topics included:
proton structure function;
polarized $ep$ scattering;
photoproduction of hadrons, jets, and prompt photons;
final states in deep inelastic scattering, with special emphasis on
hadrons, jets, resonances, and gluonic mesons;
heavy-flavour and charmonium production;
elastic and diffractive $ep$ scattering;
new physics at HERA;
and plans for HERA-II and beyond.
We hope that the high-energy-physics community will benefit from these 
proceedings, in which the ongoing efforts in understanding the nature of the
strong interactions, with particular emphasis on HERA physics, are documented.

We wish to thank all our friends and colleagues who have contributed to these
proceedings.
We are indebted to the workshop secretary, Mrs.\ Rosita Jurgeleit, for her
assistance before, during, and after the workshop and to Dr.\ Annette
Holtkamp for her technical assistance in the editorial work.
The local costs at Ringberg Castle and the costs for the publication
and dissemination of these proceedings were covered in equal parts by the
Deutsches Elektronen-Synchrotron at Hamburg and the Max-Planck-Institut f\"ur
Physik at Munich, which we gratefully acknowledge.

\bigskip

\centerline{Hamburg, January 2004\hfill}

\smallskip

\centerline{\sc\hskip8cm G\"unter Grindhammer\hfill}
\centerline{\sc\hskip8cm Bernd A. Kniehl\hfill}
\centerline{\sc\hskip8cm Gustav Kramer\hfill}
\centerline{\sc\hskip8cm Wolfgang Ochs\hfill}

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\chapter{Proton Structure}
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\section{
{\it B. Portheault:}
High $Q^2$ Structure Functions and Parton Distributions
}\newpage\addtocounter{page}{11}

\section{
{\it D. Kcira:}
Structure Functions and the Transition Region from Photoproduction
to Deep Inelastic Scattering
} \newpage\addtocounter{page}{10}

\section{
{\it S. Moch, J.A.M. Vermaseren and A. Vogt:}
Deep Inelastic Structure Functions at NNLO and Beyond
}\newpage\addtocounter{page}{7}

\section{
{\it V. Chekelian:}
Gluon Density and Strong Coupling from Structure Functions and
Measurement of $F_L$
}
\newpage\addtocounter{page}{10}

\section{
{\it S. Alekhin:}
Power corrections in the Deep Inelastic Scattering
}\newpage\addtocounter{page}{9}

\section{
{\it J. Pumplin:}
The Art of Global Fitting for Parton Distributions
}\newpage\addtocounter{page}{9}

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\chapter{Spin Physics}
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\section{
{\it M. Tytgat:}
New Results from HERMES
}\newpage\addtocounter{page}{9}

\section{
{\it D. Boer:}
Theoretical Aspects of Spin Physics
}\newpage\addtocounter{page}{9}

\section{
{\it U. St\"osslein:}
Effects of $\mathrm{e^\pm}$ Polarization on  Final States at HERA
}\newpage\addtocounter{page}{10}

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\chapter{Production of Hadrons, Jets and Photons}
\newpage
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\section{
{\it J. Cvach:}
Photoproduction of Jets and Prompt Photons at HERA
}\newpage\addtocounter{page}{12}

\section{
{\it G. Heinrich:}
Photoproduction of Isolated Photons, Single Hadrons and Jets at NLO
}\newpage\addtocounter{page}{11}

\section{
{\it C. Glasman:}
Jet Production in Deep Inelastic $ep$ Scattering at HERA
}\newpage\addtocounter{page}{9}

\section{
{\it L. J\"onsson:}
Forward Jet and Particle Production at Low x
}\newpage\addtocounter{page}{13}

\section{
{\it M. Maniatis:}
Single Hadron Production in Deep Inelastic
Scattering
}\newpage\addtocounter{page}{7}

\section{
{\it F. Corriveau:}
Photo- and Electroproduction of Single Hadrons and Resonances
}\newpage\addtocounter{page}{10}

\section{
{\it P. Minkowski and W. Ochs:}
Gluonic Meson Production
}\newpage\addtocounter{page}{11}

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\chapter{Heavy-Flavour Production}
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\section{
{\it S. Padhi:}
Open Charm and Beauty Production
}\newpage\addtocounter{page}{13}

\section{
{\it I. Schienbein:}
Open Heavy-Flavour Photoproduction at NLO
}\newpage\addtocounter{page}{9}

\section{
{\it P. Thompson:}
Experimental Results on Exclusive Vector Mesons and Heavy Quarkonium
}\newpage\addtocounter{page}{9}

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\chapter{Elastic and Diffractive $ep$ Scattering}
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\section{
{\it S. Levonian:}
Diffractive Structure Functions and QCD Fits
}\newpage\addtocounter{page}{11}

\section{
{\it N. Vlasov:}
Diffractive Jet and Charm Production
}\newpage\addtocounter{page}{9}

\section{
{\it R. B. Peschanski:}
Beyond BFKL
}\newpage\addtocounter{page}{11}

\section{
{\it O. Nachtmann:}
Pomeron Physics and QCD
}\newpage\addtocounter{page}{14}

\section{
{\it L. Motyka:}
Theory of Diffractive Meson Production
}\newpage\addtocounter{page}{9}

\section{
{\it G. Gustafson:}
Unintegrated Parton Densities and Applications
}\newpage\addtocounter{page}{10}

\section{
{\it F. Schrempp and A. Utermann:}
Instanton-Driven Saturation at Small x
}\newpage\addtocounter{page}{12}

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\chapter{New Physics at HERA}
\newpage
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\section{
{\it K. O. Diener:}
QCD Corrections to Single Top Quark and W~Boson Production at HERA
}\newpage\addtocounter{page}{9}

\section{
{\it E. Gallo:}
Search for Beyond the Standard Model Physics at HERA
}\newpage\addtocounter{page}{9}

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\chapter{Plans for HERA-II and Beyond}
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\section{
{\it E.C. Aschenauer:}
Plans for the HERMES Experiment at HERA II
}\newpage\addtocounter{page}{2}

\section{
{\it M. Klein:}
Physics with H1 at HERA II
}\newpage\addtocounter{page}{16}

\section{
{\it R. Yoshida:}
Prospects and Status of ZEUS at HERA II
}\newpage\addtocounter{page}{4}

\section{
{\it A. C. Caldwell:}
A New Round of Experiments for HERA
}\newpage\addtocounter{page}{11}

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\section*{List of participants}
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{\footnotesize
\begin{tabular}{lll}
{\sc Sergey Alekhin} & IHEP Protvino & {\tt alekhin@sirius.ihep.su} \\
{\sc Elke-Caroline Aschenauer} & DESY Hamburg & {\tt elke.aschenauer@desy.de} 
\\
{\sc Daniel Boer} & U Amsterdam & {\tt dboer@nat.vu.nl} \\
{\sc Yuraj Bracinik} & MPI Munich & {\tt juraj.bracinik@desy.de} \\
{\sc Gerd Buschhorn} & MPI Munich & {\tt gwb@mppmu.mpg.de} \\
{\sc Allen Caldwell} & MPI Munich & {\tt caldwell@mppmu.mpg.de} \\
{\sc Vladimir Chekelian} & MPI Munich & {\tt shekeln@mail.desy.de} \\
{\sc Francois Corriveau} & U McGill & {\tt francois@mail.desy.de} \\
{\sc Jaroslav Cvach} & Acad. of Sci. Prague & {\tt cvach@fzu.cz} \\
{\sc Kai Diener} & PSI Villigen  & {\tt kai.diener@psi.ch} \\
{\sc Elisabetta Gallo} & U Florence, INFN & {\tt gallo@mail.desy.de} \\
{\sc Claudia Glasman} & U Madrid & {\tt claudia@mail.desy.de} \\
{\sc G\"unter Grindhammer} & MPI Munich & {\tt guenterg@desy.de} \\
{\sc G\"osta Gustafson} & U Lund & {\tt gosta@thep.lu.se} \\
{\sc Gudrun Heinrich} & Durham, IPPP & {\tt gudrun.heinrich@durham.ac.uk} \\
{\sc Leif J\"onsson} & U Lund & {\tt leif.jonsson@hep.lu.se} \\
{\sc Rosita Jurgeleit} & MPI Munich & {\tt roj@mppmu.mpg.de} \\
{\sc Dorian Kcira} & U Wisconsin & {\tt kcira@mail.desy.de} \\
{\sc Christian Kiesling} & MPI Munich & {\tt cmk@mppmu.mpg.de} \\
{\sc Max Klein} & DESY Zeuthen & {\tt klein@ifh.de} \\
{\sc Bernd Kniehl} & U Hamburg & {\tt kniehl@mail.desy.de} \\
{\sc Gustav Kramer} & U Hamburg & {\tt kramer@mail.desy.de} \\
{\sc Sergey Levonian} & DESY Hamburg & {\tt levonian@mail.desy.de} \\
{\sc Markos Maniatis} & U Hamburg  & {\tt markos@mail.desy.de} \\
{\sc Sven Moch} & DESY Zeuthen & {\tt moch@ifh.de} \\
{\sc Leszek Motyka} & Jagellonian U Cracow & {\tt leszekm@th.if.uj.edu.pl} \\
%\end{tabular}
%\begin{tabular}{lll}
{\sc Otto Nachtmann} & U Heidelberg & {\tt 
o.nachtmann@thphys.uni-heidelberg.de} \\
{\sc Wolfgang Ochs} & MPI Munich & {\tt wwo@mppmu.mpg.de} \\
{\sc Sanjay Padhi} & DESY Hamburg & {\tt spadhi@mail.desy.de} \\
{\sc Robert Peschanski} & CNRS Saclay & {\tt pesch@spht.saclay.cea.fr} \\
{\sc Ringaile Placakyte} & MPI Munich & {\tt ringaile@mppmu.mpg.de} \\
{\sc Benjamin Portheault} & LAL Orsay & {\tt portheau@lal.in2p3.fr} \\
{\sc Jon Pumplin} & Michigan State U & {\tt pumplin@pa.msu.edu} \\
{\sc Zuzana Rurikova} & MPI Hamburg & {\tt zuzana.rurikova@desy.de}\\
{\sc Ingo Schienbein} & DESY Hamburg & {\tt schien@mail.desy.de} \\
{\sc Fridger Schrempp} & DESY Hamburg & {\tt fridger.schrempp@desy.de} \\
{\sc Uta St\"osslein} & DESY Hamburg & {\tt uta.stoesslein@desy.de} \\
{\sc Paul Thompson} & U Birmingham & {\tt thompspd@mail.desy.de} \\
{\sc Michael Tytgat} & U Gent & {\tt michael@inwfsun1.UGent.be} \\
{\sc Nikolai Vlasov} & U Freiburg & {\tt vlasov@mail.desy.de} \\
{\sc Biljana Vujicic}& MPI Munich & {\tt bivuj@mppmu.mpg.de}\\
{\sc Rik Yoshida} & Argonne & {\tt rik.yoshida@desy.de} \\
\end{tabular}
}
%\newpage
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