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We use holographic QCD to study Pomeron- and Reggeon-mediated centralproduction in Regge regime hadronic scattering. We focus specifically on $\eta$production in proton-proton collisions. While previous work studied thePomeron-mediated process, the mesonic Regge trajectories ("Reggeons") we nowincorporate contribute significantly at experimentally probed energies. We usethe five-point open string amplitude (in flat space) to construct approximatepropagators for the Reggeon states, and the five-point closed string amplitudefor the Pomeron. Using these "holographic" Reggeons and Pomerons, andlow-energy couplings derived in the Sakai-Sugimoto model, we compute thedifferential and total cross sections at $\sqrt{s}$ =29.1 GeV. Our calculationof the total cross section is $\sigma =236 \ \mathrm{nb}$, while theexperimentally measured value is $\sigma = 3859 \ \mathrm{nb}$. The discrepancybetween our result and the measured value may indicate that our modelsystematically underestimates the values of the relevant coupling constants.

Central Production of $\eta$ via Double Pomeron Exchange and Double Reggeon Exchange in the Sakai-Sugimoto Model