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

Abstract

We consider the phenomenology of a 750 GeV resonance X which can be produced at the LHC by only photon fusion and subsequently decay into di-photons. We propose that the spin-zero state X is coupled to a heavy lepton that lives in the bulk of a higher-dimensional theory and interacts only with the photons of the Standard Model. We compute the di-photon rate in these models with two and more compact extra dimensions and demonstrate that they allow for a compelling explanation of the di-photon excess recently observed by the ATLAS and CMS collaborations. The central role in our approach is played by the summation over the Kaluza-Klein modes of the new leptons, thus providing a significant enhancement of the $X\to \gamma \gamma$ loops for the production and decay subprocesses. It is expected that the jet activity accompanying these purely electromagnetic (at the partonic level) processes is numerically suppressed by factors such as ${\alpha }_{em}^2{C}_{q\bar{q}}/C_{\gamma \gamma }\sim 10^{-3}$.

New section discussing constraints from perturbativity; references added; matches the journal version; 23 pages, 3 figures

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Cited by in corpus (10)

• Diphoton Resonance from a Warped Extra Dimension
• Diphoton excess at 750 GeV and LHC constraints in models with vector-like particles
• Diphoton Excess and Running Couplings
• Models of LHC Diphoton Excesses Valid up to the Planck scale
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