Search for the minimal universal extra dimension model at the LHC with $\sqrt{s}$=7 TeV

Understand

Universal Extra Dimension (UED) model is one of the popular extension of the Standard Model (SM) which offers interesting phenomenology.

• In the minimal UED (mUED) model, Kaluza-Klein (KK) parity conservation ensures that $n=1$ KK states can only be pair produced at colliders and the lightest KK particle is stable.
• In most of the parameter space, first KK excitation of SM hypercharge gauge boson is the lightest one and it can be a viable dark matter candidate.
• Thus, the decay of $n=1$ KK particles will always involve missing transverse energy as well as leptons and jets.