KK-parity non-conservation in UED confronts LHC data

Kaluza–Klein (KK) parity can be violated in a five-dimensional universal extra-dimensional model with boundary-localised (kinetic or mass) terms (BLTs) at the fixed points of S1/Z2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$S^1/Z_2$$\end{document} 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 (for the first time, to our knowledge) given by the LHC experiment to constrain the mass range of the first KK-excitation of the electroweak gauge bosons (B1andW31\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$B^1\ \mathrm{and } \ W_3^1$$\end{document}). It is interesting to note that the LHC result puts an upper limit on the masses of the n=1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$n=1$$\end{document} KK-leptons for positive values of the BLT parameters depending upon the mass of the ℓ+ℓ-\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\ell ^{+}\ell ^{-}$$\end{document} resonance.