LHC limits on KK-parity non-conservation in the strong sector of universal extra-dimension models

Abstract

In five-dimensional universal extra-dimensional models compactified on an $S^1/Z_2$ orbifold four-dimensional kinetic terms are allowed at the two fixed points. If these terms are unequal then Kaluza-Klein (KK) parity is broken. Within such a framework we consider resonant production of the n = 1 KK-gluon at the Large Hadron Collider and its subsequent decay to $t\bar{t}$, where both production and decay are KK-parity non-conserving. We use, for the first time, the exclusion data for a $t\bar{t}$ resonance obtained by the ATLAS collaboration to limit the mass ranges of quark and gluon excitations of the KK-parity-violating model which are found to be in the ballpark of 900 GeV.

Comments: v2: Results based on 8 TeV LHC data, Figures and discussions now in terms of exclusion regions of KK-excitation masses, Published version