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We consider the phenomenology of a 750 GeV resonance X which can be producedat the LHC by only photon fusion and subsequently decay into di-photons. Wepropose that the spin-zero state X is coupled to a heavy lepton that lives inthe bulk of a higher-dimensional theory and interacts only with the photons ofthe Standard Model. We compute the di-photon rate in these models with two andmore compact extra dimensions and demonstrate that they allow for a compellingexplanation of the di-photon excess recently observed by the ATLAS and CMScollaborations. The central role in our approach is played by the summationover the Kaluza-Klein modes of the new leptons, thus providing a significantenhancement of the $X\to \gamma\gamma$ loops for the production and decaysubprocesses. It is expected that the jet activity accompanying these purelyelectromagnetic (at the partonic level) processes is numerically suppressed byfactors such as $\alpha_{em}^2 C_{q\bar{q}}/C_{\gamma\gamma}\sim 10^{-3}$.

Photo-production of a 750 GeV di-photon resonance mediated by Kaluza-Klein leptons in the loop