KK-parity non-conservation in UED confronts LHC data

TL;DR

This paper investigates how KK-parity violation in a 5D universal extra dimension model affects LHC signals, constraining the masses of KK excitations of electroweak gauge bosons using recent experimental data.

Contribution

It provides the first analysis of LHC constraints on KK excitations in models with boundary-localized terms causing KK-parity violation.

Findings

LHC data constrains the mass range of first KK-electroweak gauge bosons.

Upper limits are set on KK-lepton masses for positive boundary-localized parameters.

Resonance searches impact the allowed parameter space of UED models with KK-parity violation.

Abstract

Kaluza-Klein (KK) parity can be violated in five-dimensional universal extra dimensional model with boundary-localized (kinetic or mass) terms (BLTs) at the fixed points of $S^1/Z_2$ orbifold. In this framework we study the resonant production of Kaluza-Klein excitations of the neutral electroweak gauge bosons at the LHC and their decay into an electron-positron pair or a muon-antimuon pair. We use the results (first time in our knowledge) given by the LHC experiment to constrain the mass range of the first KK-excitation of the electroweak gauge bosons ($B^1\ \textrm{and} \ W_3^1$). It is interesting to note that the LHC result puts an upper limit on the masses of the $n=1$ KK-leptons for positive values of BLT parameters and depending upon the mass of $\ell^{+}\ell^{-}$ resonance.