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One of the open questions of the strong interaction theory is the existence of the odderon, which is an unambiguous prediction of quantum chromodynamics, but still not confirmed experimentally. An alternative to probe the odderon is the exclusive ηc photoproduction in hadronic collisions. As the Pomeron exchange cannot contribute to this process, its observation would indicate the existence of the odderon. In this paper we estimate the ηc production in photon-induced interactions in hadronic collisions at the AFTER@LHC experiment. We demonstrate that the experimental analysis of this process is feasible in the AFTER@LHC experiment and that the observation of the ηc production in nuclear collisions is an unambiguous signature of the odderon. [ABSTRACT FROM AUTHOR]

The existence of a dilaton as a pseudo-Nambu-Goldstone boson in spontaneous breaking of scale symmetry is predicted in beyond standard model theories in which electroweak symmetry is broken via strongly coupled conformai dynamics. Such a particle is expected to have a mass below the conformai symmetry breaking scale f and couplings to standard model particles similar to those of the SM Higgs boson. In this paper we estimate, for the first time, the dilaton production in exclusive processes considering Pomeron-Pomeron (PP) and photon-photon (γγ) interactions, which are characterized by two rapidity gaps and intact hadrons in the final state. Our results indicate that if the dilaton is massive (Mx ≥ 2Mw), the study of dilaton production by PP interactions in pp collisions can be useful to determine its mass and the conformai energy scale. [ABSTRACT FROM AUTHOR]

In this paper we study the diffractive Z boson pair production mediated by the Kaluza-Klein graviton in the large extra dimensions scenario at the CERN Large Hadron Collider energies. Considering the Durham model, we estimate the total cross section for the central inclusive and exclusive diffractive production of a Z boson pair in pp/pPb/PbPb collisions. Our results indicate that the experimental analysis of the central inclusive production in pp collisions is feasible at the CERN LHC. [ABSTRACT FROM AUTHOR]

The diffractive photon production at large momentum transfer and large energies is a probe of the parton dynamics of the diffractive exchange. In this paper we revisit the leading order Balitsky-Fadin-Kuraev-Lipatov equation approach for this process and estimate, for the first time, the differential and total cross sections considering the next-to-leading order corrections for the Balitsky-Fadin-Kuraev-Lipatov characteristic function. We obtain a reasonable agreement with the DESY-HERA data. [ABSTRACT FROM AUTHOR]

The exclusive production of magnetic monopoles and the bound states of magnetic monopoles (the monopolium) by the photon fusion is considered in different high energy processes. More specifically, we calculate the total cross sections of the ultraperipheral elastic collisions of electron-electron, proton-proton, and lead-lead in present and future colliders, comparing with the previous results found in the literature. Our results indicate that magnetic monopoles or the bound states, if both exist, can be measurable in future electron-electron colliders. [ABSTRACT FROM AUTHOR]

We provide a universal expression of cross sections for the exclusive vector meson production and deeply virtual Compton scattering (DVCS) in photon-proton and photon-nucleus interactions based on the geometric scaling phenomenon. The theoretical parametrization based on the scaling property depends only on the single variable τA=Q²/Q²sat, where the saturation scale, Qsat, drives the energy dependence and the corresponding nuclear effects. This phenomenological result describes all available data from DESY-HERA for ρ,ϕ,J/ψ production and DVCS measurements. A discussion is also carried out on the size of nuclear shadowing corrections on photon-nucleus interaction. [ABSTRACT FROM AUTHOR]