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We discuss the discovery potential of light-by-light scattering at the LargeHadron Collider (LHC), induced by the Standard Model (SM) and by new exoticcharged particles. Our simulation relies on intact proton detection in theplanned forward detectors of CMS and ATLAS. The full four-photon amplitudesgenerated by any electrically charged particles of spins $1/2$ and $1$,including the SM processes involving loops of leptons, quarks and $W$ bosonsare implemented in the Forward Physics Monte Carlo generator. Our methodprovides model-independent bounds on massive charged particles, onlyparametrized by the spin, mass and "effective charge" $Q_{\rm eff}$ of the newparticle. We find that a new charged vector (fermion) with $Q_{\rm eff}=4$ canbe discovered up to $m=640~\rm GeV$ ($m=300~\rm GeV$) with an integratedluminosity of $300~\rm fb^{-1}$ at the LHC. We also discuss the sensitivitiesto neutral particles such as a strongly-interacting heavy dilaton and warpedKaluza-Klein gravitons, whose effects could be discovered for masses in themulti-TeV range.

Light-by-light scattering with intact protons at the LHC: from Standard Model to New Physics