Empirical Tests
Up to now, no experimental or observational signs of extra dimensions have been officially reported. Many theoretical search techniques for detecting Kaluza-Klein Resonances have been proposed using the mass couplings of such resonances with the top quark, however until the LHC reaches full operational power observation of such resonances are unlikely. An analysis of results from the Large Hadron Collider in December 2010 severely constrains theories with large extra dimensions.
The Discovery of a new boson with Higgs-like decay channels measured experimentally to significance to 4.9 sigma puts a brand new empirical test in the search for Kaluza-Klein Resonances and Supersymmetric Particles. The loop Feynman Diagrams that exist in the Higgs Interactions allow any particle with electric charge and mass to run in such a loop. Standard Model particles besides the top quark and W boson do not make big contributions to the cross-section observed in the H → γγ decay, but if there are new particles beyond the Standard Model, they could potentially change the ratio of the predicted Standard Model H → γγ cross-section to the experimentally observed cross-section. Hence a measurement of any dramatic change to the H → γγ cross section predicted by the Standard Model is crucial in probing the physics beyond it.
Read more about this topic: Kaluza–Klein Theory
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