Dark matter searches in jet plus missing energy events in γp collisions at the CERN LHC

In this paper, we investigate the gamma p photoproduction of jet plus missing energy signal to set limits on the couplings of the fermionic dark matter to the quarks at the LHC via the main reaction pp -> p gamma p -> p chi chi j. We assume typical LHC multipurpose forward detectors and work in a model independent effective field theory framework. Typically, when we do the background analysis, we also include their corresponding single diffractive productions. Our result shows that by requiring a 5 sigma (S/ root B >= 5) signal deviation, with an integrated luminosity of L = 200 fb(-1), the lower bounds of the weakly interacting massive particle masses scale can be detected up to. equal to 665.5, 808.9, and 564.0 GeV for the forward detector acceptances xi(1), xi(2), and xi(3), respectively, where 0.0015 < xi(1) < 0.5, 0.1 < xi(2) < 0.5 and 0.0015 < xi(3) < 0.15.