Universal extra dimensions after Higgs discovery

Understand

We show bounds on five- and six-dimensional universal extra dimension (UED) models from the latest results of the Higgs searches at the LHC and from the electroweak precision data for the S and T parameters.

• We consider the minimal UED model in five dimensions and the ones in six dimensions.
• The highest possible ultraviolet cutoff scale for each UED model is evaluated from the electroweak vacuum stability by solving the renormalization group equation of the Higgs self-coupling.
• This scale turns out to be lower than the conventional one obtained from the perturbativity of the gauge coupling.