Collider implications of universal extra dimensions

We consider the universal extra dimensions scenario of Appelquist, Cheng, and, in which all of the SM fields propagate into one extra compact, estimated therein to be as large as \~ (350 GeV)⁻¹.-level KK number conservation dictates that the associated KK excitations not be singly produced. We calculate the cross sections for the direct of KK excitations of the gluon, \, and two distinct towers of, \ and \, in proton-antiproton collisions at the Tevatron Run I II energies in addition to proton-proton collisions at the Large Hadron energy. The experimental signatures for these processes depend on the of the lowest-lying KK excitations of the gluons and light quarks. We that the Tevatron Run I mass bound for KK quark and gluon final states is 350--400 GeV, while Run II can push this up to 450--500 GeV at its luminosity and 500--550 GeV if the projected final luminosity is. The LHC can probe much further: The LHC will either discover UED KK of quarks and gluons or extend the mass limit to about 3 TeV.