Kaluza-Klein graviton phenomenology for warped compactifications, and the 750 GeV diphoton excess

Understand

A generic prediction of scenarios with extra dimensions accessible in TeV-scale collisions is the existence of Kaluza-Klein excitations of the graviton.

• For a broad class of strongly-warped scenarios one expects to initially find an isolated resonance, whose phenomenology in the simplest cases is described by a simplified model with two parameters, its mass, and a constant $\Lambda$ with units of mass parameterizing its coupling to the Standard Model stress tensor.
• These parameters are in turn determined by the geometrical configuration of the warped compactification.
• We explore the possibility that the 750 GeV excess recently seen in 13 TeV data at ATLAS and CMS could be such a warped Kaluza-Klein graviton, and find a best-fit value $\Lambda\approx 60$ TeV.