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\@writefile{toc}{\contentsline {section}{\numberline {1}Introduction}{1}}
\newlabel{s_intro}{{1}{1}}
\@writefile{toc}{\contentsline {section}{\numberline {2}Event selection}{1}}
\@writefile{lof}{\contentsline {figure}{\numberline {1}{\ignorespaces \it  Illustration of the generic process $\gamma p \rightarrow XY$. In the Regge pole picture, a reggeon is exchanged between the photon and the proton.}}{2}}
\newlabel{f_gproc}{{1}{2}}
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\@writefile{toc}{\contentsline {section}{\numberline {3}$M_{X}$ reconstruction}{3}}
\newlabel{e_mxrec}{{1}{3}}
\@writefile{toc}{\contentsline {section}{\numberline {4}Simulations}{3}}
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\@writefile{toc}{\contentsline {section}{\numberline {5}Extraction of the differential cross section $d\sigma _{\gamma p}/d M_{X}^{2}$}{4}}
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\@writefile{toc}{\contentsline {section}{\numberline {6}Results}{5}}
\@writefile{toc}{\contentsline {subsection}{\numberline {6.1}Effective trajectory intercept as a function of $M_X$}{5}}
\newlabel{s_alphaeff}{{6.1}{5}}
\newlabel{E_3Regge2}{{2}{5}}
\@writefile{toc}{\contentsline {subsection}{\numberline {6.2}Triple Regge model}{5}}
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\newlabel{E_3Regge1}{{3}{5}}
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\@writefile{toc}{\contentsline {section}{\numberline {7}Conclusion}{6}}
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\bibcite{kaidalov}{15}
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\bibcite{goulianos}{17}
\bibcite{zotov}{18}
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\@writefile{lof}{\contentsline {figure}{\numberline {2}{\ignorespaces \it  The Differential cross section measurement $M_X^2 \mskip \thickmuskip  d \sigma / dM_X^2$ for $M_Y<$ 1.6 GeV and $\mid t \mid <$ 1 GeV$^2$. A comaprison with a previous H1 measurement is made for the $\gamma p$ center of mass energies $W$=231 and 187 GeV. The new measurement yields additional data at $W$=91 GeV.}}{8}}
\newlabel{f_cs_compare}{{2}{8}}
\@writefile{lof}{\contentsline {figure}{\numberline {3}{\ignorespaces For each fixed $M_x^2$-bin measured, the $W$ dependence is fitted to extract an effective intercept $\alpha _{eff}(0)$. The results of the fits are shown for each $M_x^2$-bin.}}{9}}
\newlabel{f_stamp}{{3}{9}}
\@writefile{lof}{\contentsline {figure}{\numberline {4}{\ignorespaces The $M_x^2$ evolution of $\alpha _{eff}(0)$ is shown from H1 data. One additional point is added from the leading proton data \cite  {lp}. For comparison, the shaded band shows the result for $\alpha _{{I\mskip -\thinmuskip \mskip -\thinmuskip P}}(0)$ from the triple Regge fit, where the $M_X$ dependence is also fitted.}}{10}}
\newlabel{f_alphaeff}{{4}{10}}
\@writefile{lof}{\contentsline {figure}{\numberline {5}{\ignorespaces \it  Illustration of the Mueller-Regge approach to the inclusive photon dissociation cross section. It relates the sum over all final states X to the forward amplitude for the process $\gamma \mskip \thickmuskip  \alpha _i(t) \rightarrow \gamma \mskip \thickmuskip  \alpha _j(t)$ at an effective centre of mass energy $M_X$ (middle diagram). For sufficiently large $M_X$, a Regge expansion for the photon-reggeon scattering amplitude is also appropriate, such that the dissociation cross section may be decomposed into triple-Regge terms as shown in the last diagram of the figure.}}{11}}
\newlabel{f_3regge}{{5}{11}}
\@writefile{lof}{\contentsline {figure}{\numberline {6}{\ignorespaces The results of the Triple Regge fit performed over the present H1 rapidity gap data, the H1 leading proton data \cite  {lp} and fixed target data \cite  {ft}. The details are explained in the text. }}{12}}
\newlabel{f_reggefit}{{6}{12}}
\@writefile{lof}{\contentsline {figure}{\numberline {7}{\ignorespaces A summary of H1 $\alpha _{{I\mskip -\thinmuskip \mskip -\thinmuskip P}}(0)$ measurements versus $Q^2$ for $\gamma ^{(\ast )} p \rightarrow X p$. A previous ZEUS result \cite  {p_zeus} at $Q^2 = 0$ is also shown.}}{13}}
\newlabel{f_intercepts}{{7}{13}}