this approach, the Durham group estimates the survival probability for the diffractive Higgs production to be 3% in LHC ($\sqrt{s} = 14\textrm{ TeV}$) and 5% in Tevatron ($\sqrt{s} = 1.96\textrm{ TeV}$).

NUMERICAL RESULTS {#sec:results}
=================

The results for the Higgs photoproduction are obtained with the help of a set of parametrizations of the gluon distribution function in the proton [@lhapdf].

The first step is to compare the results obtained for the photoproduction approach with those for the Higgs production in direct $pp$ collisions carried out in Ref. [@forshaw-KMR]. Hence, the prediction for the differential cross section in central-rapidity for LHC is calculated using the parametrization MRST2001 in Leading Order (LO) approximation for the gluon distribution function, taking the initial momentum at $\boldsymbol{k}^{2}_{0} = 1.0 \textrm{ GeV}^{2}$. The results are expressed in Fig. \[fig:forshaw\], where the event rate is fitted in function of the Higgs boson mass. The smallest figure represents the result in the mass range where the approximation to $F(x)$, present in the $gg \to H$ production vertex, is valid. As the mass increases, the curve seems to diverge, however extending the mass range to largest values of the Higgs mass, one sees that this growth is reduced, which 