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%===============================title page=============================
\begin{document}  
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% Journal macro
\def\Journal#1#2#3#4{{#1} {\bf #2} (#3) #4}
\def\NCA{\em Nuovo Cimento}
\def\NIM{\em Nucl. Instr. Methods}
\def\NIMA{{\em Nucl. Instr. Methods} {\bf A}}
\def\NPB{{\em Nucl. Phys.}   {\bf B}}
\def\PLB{{\em Phys. Lett.}   {\bf B}}
\def\PRL{\em Phys. Rev. Lett.}
\def\PRD{{\em Phys. Rev.}    {\bf D}}
\def\ZPC{{\em Z. Phys.}      {\bf C}}
\def\EJC{{\em Eur. Phys. J.} {\bf C}}
\def\CPC{\em Comp. Phys. Commun.}

\begin{titlepage}

\noindent
%Version:     (\today) \\
%Version:     2.2 \\
%Editors:     D.~Brown, A.~Meyer, P.~Thompson  \\
%Referees:    T.~Sloan, O.~Behnke       \\
%Final reading April 16th 2003


\vspace{5cm}

\begin{center}
\vspace*{3cm}
\begin{Large}

{\bf \boldmath Diffractive Photoproduction of ${J/\psi}$  Mesons \\
with Large Momentum Transfer \\ at HERA}

\vspace{2cm}

H1 Collaboration

\end{Large}
\end{center}

\vspace{2cm}

\begin{abstract}
\noindent
The diffractive photoproduction of $J/\psi$ mesons
is measured with the H1 detector  at the $ep$ collider HERA 
using an integrated luminosity of 78 pb$^{-1}$.
The differential cross section ${\rm d}\sigma(\gamma p \rightarrow J/\psi Y)
/{\rm d}t$
is studied in the range  $2 < |t| < 30 \rm ~GeV^{2}$,
where $t$ is the square of the four-momentum transferred at the
proton vertex. 
The cross section is also presented
as a function of the photon-proton centre-of-mass
energy $W_{\gamma p}$ in three $t$-intervals,  spanning the range
$50 < W_{\gamma p} < 200 \ {\rm GeV}$. 
A fast rise 
of the cross section with  $W_{\gamma p}$ is observed 
for each $t$ range 
and a slope for the effective linear
Pomeron trajectory of
$\alpha^{\prime}_{\pom}= -0.0134 \pm 0.0074 (stat.) \pm 0.0065 (syst.)~{\rm GeV^{-2}}$
is obtained.
Perturbative QCD models based on BFKL and DGLAP evolution 
are able to provide a general description of
the data. The data are found to be compatible with $s$-channel helicity
conservation.
\end{abstract}



\vspace{1.5cm}

\begin{center}
Prepared for DIS 2003, St.Petersburg
\end{center}

\end{titlepage}



\newpage
\setlength{\unitlength}{1pt}

\begin{figure}[h]
\centering
\vskip -1.0cm
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\put(-75,0){\includegraphics[width=17.0cm]{H1prelim-03-073.fig1.eps}}
\end{picture}
\caption{The $\mu^+ \mu^-$ invariant mass distribution 
after final selection cuts in the kinematic region $|t|>2~{\rm GeV^{2}}$.
The histogram shows the sum of the Monte Carlo simulations 
of $J/\psi$ production using HITVM (open histogram), 
the contribution from lepton pair production as simulated by 
the LPAIR program (dark shaded histogram) and the 
contribution from diffractive $\psi(2S)$ events as simulated with the 
DIFFVM program (light shaded histogram).}
\label{fig:signal}
\end{figure}


\newpage
\begin{figure}[ht]
\centering
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%\put(-0.8, -.3 ){\epsfig{figure=plots/control.eps,height=19.6cm}}
\put(-0.8, -.3 ){\includegraphics[height=19.6cm]{H1prelim-03-073.fig2.eps}}
\put( 2.3,18.7){\large a)}
\put(10.3,18.7){\large b)}
\put( 2.3,13.7){\large c)}
\put(14.3,13.7){\large d)}
\put( 2.3, 8.7){\large e)}
\put(10.3, 8.7){\large f)}
\put( 6.3, 3.7){\large g)}
\end{picture}
\caption{Kinematic distributions of the $J/\psi$ meson and
its decay lepton tracks for events in the mass range 
$2.9 < M_{\mu^{+} \mu^{-}} < 3.3 \ {\rm GeV}$.
%after final selection cuts:
a) The polar angle $\theta^{\mu}$ and b) the transverse momentum $p_t^{\mu}$
of the decay lepton tracks.
c) The inelasticity $z$ and 
d) the photon-proton centre of mass energy $W_{\gamma p}$
of the $J/\psi$ meson.
e) The distribution of the cosine of the polar angle 
and f) the azimuthal distribution
of the positively charged decay muon in the helicity frame.
g) The distribution of the squared transverse momentum  of the $J/\psi$.
The data are shown by the points and the HITVM Monte Carlo simulation
by the shaded histogram.}
\label{fig:control}
\end{figure}



\newpage
\begin{figure}[ht]
\centering
\begin{picture}(400,500)
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\end{picture}
\caption{The photon-proton differential cross section 
${\rm d}\sigma/{\rm d}t$ for $J/\psi$ production
in the kinematic range $50<W_{\gamma p}<150$ GeV,
$|t|>2.0$ GeV$^{2}$ and $z>0.95$. 
The inner error bars correspond to the statistical error,
the outer error bars are the statistical and systematic
errors added in quadrature.
The solid line shows the prediction from the BFKL calculation 
in the leading log approximation for fixed 
$\alpha_S=0.18$~\cite{Enberg:2002zy}.
%The width of the band reflects the uncertainty of the 
%calculation when varying the energy
%scale parameter $W_0^2=M_V^2/4$ by a 
%factor of four for fixed $\alpha_S$.
The dashed (dotted) curve corresponds to the BFKL calculation 
including non-leading corrections and using 
a fixed (running) $\alpha_S$ \cite{Enberg:2002zy}.
Also shown (dashed-dotted curve in the range $-t < M_{J/\psi}^2$)
is the result of a calculation based on the
DGLAP equation in the leading log 
approximation \cite{Gotsman:2001ne}.}
\label{fig:t}
\end{figure}

\newpage
\begin{figure}[ht]
\centering
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%\put(-20,0){\epsfig{figure=plots/wintbins_col.eps,width=16.0cm}}
\end{picture}
\caption{The photon-proton cross section 
as a function of $W_{\gamma p}$ in three bins of $t$.
The inner error bars correspond to the statistical error,
the outer error bars are the statistical and systematic
errors added in quadrature.
The solid lines show the predictions from the BFKL calculation 
in the leading log approximation and
the dashed lines correspond to the results from the 
NL BFKL calculation using a fixed $\alpha_S$ \cite{Enberg:2002zy}.
Also shown (dashed-dotted curve) is the result of a calculation based on the
DGLAP LL equation \cite{Gotsman:2001ne}.}
\label{fig:w}
\end{figure}



\newpage
\begin{figure}[ht]
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\put(10.5,17.0){\large b)}
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\put(10.5,4.7){\large f)}
%\put(6.9,18.){\large   {\boldmath  $2 < -t < 5 \ {\sf GeV}^2$}}
%\put(6.7,11.8){\large  {\boldmath $ 5 < -t < 10 \ {\sf GeV}^2$}}
%\put(6.6,5.7){\large   {\boldmath $10 < -t < 30 \ {\sf GeV}^2$}}
\end{picture}
\caption{Normalised decay angular distributions for $J/\psi$ 
meson production in three bins of $t$:
a,b) $2<|t|<5$ GeV$^2$; c,d) $5<|t|<10$ GeV$^2$ and 
d,e) $10<|t|<30$ GeV$^2$. 
The left column(a,c,e) shows the azimuthal 
distributions $\phi^*$ of the positively charged decay muon in the 
helicity frame and the right column(b,d,f) shows the polar 
angular distributions $\cos{\theta^*}$.
The inner error bars show the statistical error. The outer error 
bars include the statistical and systematical errors added in quadrature.
%The solid lines show the results of the fits to the data (see text).
The dashed line shows the expectation from $s$-channel helicity
conservation.}
\label{fig:angular}
\end{figure}

\newpage
\begin{figure}[ht]
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\centering
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\put( 2.4, 11.0){\large b)}
\put( 2.4 ,4.8){\large c)}
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\caption{ 
The three spin density matrix elements 
a) $r_{1-1}^{04}$, 
b) $r_{00}^{04}$ 
and c) ${\rm Re} \{ {r^{04}_{10} } \}$
for the \jpsi\ as a function of $t$. The inner error bars represent the 
statistical
uncertainty and the outer error bars the combined
statistical and systematic uncertainties.
The dashed line shows the expectation from SCHC. Also shown on the
figure are the results from the ZEUS collaboration for the
photoproduction of \jpsi\ and $\rho^0$ 
mesons \cite{Chekanov:2002rm}.}
\label{fig:rrr}
\end{figure}


\end{document}





