Collider implications of Kaluza-Klein excitations of the gluons

Abstract

We consider an asymmetric string compactification scenario in which the standard model (SM) gauge bosons can propagate into one ${\mathrm{TeV}}^{\mathrm{\ensuremath{-}}1}$-sized extra compact dimension. These gauge bosons have associated Kaluza-Klein (KK) excitations that present additional contributions to the SM processes. We calculate the effects that the KK excitations of the gluons, ${g}^{★}'\mathrm{s},$ have on multijet final-state production in proton-proton collisions at the CERN Large Hadron Collider energy. In the case of dijet final states with very high ${p}_{T},$ the KK signal due to the exchanges of the ${g}^{★}'\mathrm{s}$ is several factors greater than the SM background for compactification scales as high as about 7 TeV. The high-${p}_{T}$ effect is not as dramatic for the direct production of a single on-shell ${g}^{★},$ which subsequently decays into $q\ensuremath{-}\overline{q}$ pairs, where the KK signal significantly exceeds the SM three-jet background for compactification scales up to about 3 TeV. We also present our results for the four-jet final-state signal from the direct production of two on-shell ${g}^{★}'\mathrm{s}.$