Universal extra dimension: Violation of Kaluza-Klein parity
Abstract
The minimal Universal Extra Dimension (mUED) model respects the Kaluza-Klein (KK) parity (-1)n, where n is the KK number. However, it is possible to have interactions located at only one of the two fixed points of the S1/ orbifold. Such asymmetric interactions violate the KK parity. This kills the cold dark matter component of UED but also removes the upper bound on the inverse compactification radius, and thus non-observation of the KK excitations even at the Large Hadron Collider does not necessarily invalidate the model. Apart from the decay of the lightest n=1 KK excitation, this leads to collider signals which are markedly different from those in the mUED scenario. The phenomenological consequences of such KK-parity violating terms are explored.