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\begin{titlepage}

\noindent
\begin{flushleft}
{\bf H1prelim-13-011} Submitted to    \\
\noindent\rule{20cm}{1.8pt}
{\bf XXI International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS2013}, April 22-26, 2013, Marseille~~~~~~~~
Parallel Session~~~~~~~~~~~~{\bf QCD and Final States}\\
\noindent\rule{20cm}{1.8pt}
{\it Electronic Access: www-h1.desy.de/publications/H1preliminary.short\_list.html}
\end{flushleft}

\vspace{2cm}
\begin{center}
\begin{Large}


	{ \bf Measurement of Diffractive Dijet Photoproduction with Leading Proton }
\vspace{2cm}

H1 Collaboration

\end{Large}
\end{center}

\vspace{2cm}

\begin{abstract}

The cross section of diffractive photoproduction processes $e^{+}p \to eXp$ is measured, where the system $X$
contains at least 2 jets with $E_T^{\mathrm{jet1}} > 5.5\, \mathrm{GeV}$ and  $E_T^{\mathrm{jet2}}~ >~4\,\mathrm{GeV}$ and the diffractive proton in the kinematic region $0.010<~x_{I\!P}<~0.024$ and $|t|~<~0.6\,\mathrm{GeV^2}$ is tagged in the Very Forward Proton Spectrometer (VFPS) of the H1
detector.  The measurement is performed for untagged photoproduction with $Q^{2} <2\, \mathrm{GeV^2}$ in photon virtuality.
The results are compared to next-to-leading order QCD calculations and with MC model based on leading order matrix elements with parton showers.

The measured cross sections
are smaller than those obtained from the next-to-leading order calculations by a factor of
about 0.67.
This suppression factor has no significant dependence on the fraction $x_{\gamma}$ of the
photon four-momentum entering the hard subprocess.
\end{abstract}

\vspace{1.5cm}

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%To be submitted to \EJC \;\; or \PLB
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\newpage


\begin{figure}[ht]
	\begin{center}
		\includegraph[width=0.45\textwidth]{H1prelim-13-011.fig1a.eps} 
		\includegraph[width=0.45\textwidth]{H1prelim-13-011.fig1b.eps} 
		\includegraph[width=0.45\textwidth]{H1prelim-13-011.fig1c.eps} 
		\includegraph[width=0.45\textwidth]{H1prelim-13-011.fig1d.eps} 
		\caption{The differential cross section are shown as a function
			of $z_{I\!P}$ , $x_{\gamma}$, $x_{I\!P}$ and $y$. The inner error bars represent the statistical errors. The outer error
	bars indicate the statistical and systematic errors added in quadrature. NLO QCD predictions
based on the DPDF set H1 2006 Fit B, corrected to the level of stable hadrons, are shown as a
white line.  The red band indicates the DPDFs uncertainties and light green band
indicates the DPDFs and scale uncertainties added in quadrature. LO QCD predictions
based on the same DPDF set are shown as a dashed black line.}
		\label{histo1}
	\end{center}
\end{figure}

\begin{figure}[ht]
	\begin{center}
		\includegraph[width=0.45\textwidth]{H1prelim-13-011.fig2a.eps} 
		\includegraph[width=0.45\textwidth]{H1prelim-13-011.fig2b.eps} 
		\includegraph[width=0.45\textwidth]{H1prelim-13-011.fig2c.eps} 
		\includegraph[width=0.45\textwidth]{H1prelim-13-011.fig2d.eps} 
		\caption{The differential cross section are shown as a function
			of $\langle \eta^{\mathrm{jets}}\rangle$ , $\Delta \eta^{\mathrm{jets}}$, $M_{12}$ and $M_{X}$. The inner error bars represent the statistical errors. The outer error
	bars indicate the statistical and systematic errors added in quadrature. NLO QCD predictions
based on the DPDF set H1 2006 Fit B, corrected to the level of stable hadrons, are shown as a
white line.  The red band indicates the DPDFs uncertainties and light green band
indicates the DPDFs and scale uncertainties added in quadrature. LO QCD predictions
based on the same DPDF set are shown as a dashed black line.}
		\label{histo2}
	\end{center}
\end{figure}

\begin{figure}[ht]
	\begin{center}
		\includegraph[width=0.6\textwidth]{H1prelim-13-011.fig3.eps} 
		\caption{
		The differential cross section is shown as a function
		of $E_T^{\mathrm{jet1}}$. The inner error bars represent the statistical errors. The outer error
	bars indicate the statistical and systematic errors added in quadrature. NLO QCD predictions
based on the DPDF set H1 2006 Fit B, corrected to the level of stable hadrons, are shown as a
white line.  The red band indicates the DPDFs uncertainties and light green band
indicates the DPDFs and scale uncertainties added in quadrature. LO QCD predictions
based on the same DPDF set are shown as a dashed black line.
		}
		\label{histo3}
	\end{center}
\end{figure}






\end{document}
