Diffractive Dijet Photoproduction in ep Collisions with a Leading Proton at HERA

Differential cross sections of the diffractive photoproduction process $e^+p \rightarrow eXp$ are measured using the data collected with H1 detector at HERA in 2006 and 2007 which correspondes to an integrated luminosity of 30 pb$^{−1}$. The system X is required to contain at least 2 jets with a minimum transvers energy $E_T^{jet1(2)} = 5.5(4)$ GeV and the outgoing proton is tagged in Very Forward Proton Spectrometer (VFPS). The measurement is performed for untagged photoproduction with $Q^2