In the Universal Extra Dimensions model of Appelquist, Cheng and Dobrescu, of the Standard Model fields are placed in the bulk and thus have-Klein(KK) excitations. These KK states can only be pair produced at due to the tree-level conservation of KK number, with the lightest of being stable and possibly having a mass as low as \ 350-400 GeV. calculating the contribution to $g-2$ in this model we investigate the cross sections and signatures for these particles at both hadron and colliders. We demonstrate that these signatures critically depend upon the lightest KK states remain stable or are allowed to decay by any of number of new physics mechanisms. These mechanisms which induce KK decays are in detail.
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Thomas G. Rizzo (2001) studied this question.
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