Vacuum stability constraints and LHC searches for a model with a universal extra dimension

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Abstract

If the new boson lying in the narrow mass range between 122 and 127 GeV is confirmed to be a Higgs boson, then stability of the electroweak vacuum in a minimal model with a universal extra dimension (mUED) will require a much lower cutoff for the theory than has been envisaged earlier. We show that this low cutoff leads to important changes in much of the minimal model with a universal extra dimension phenomenology studied till now. In particular, prospects for LHC searches for $n=1$ states are rather limited, while resonant $n=2$ states may go completely undetected. Prospects for detection at high energy ${e}^{+}{e}^{\ensuremath{-}}$ colliders are less affected.

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