Hunting for the top partner in the littlest Higgs model with T parity at the CERN LHC

Little Higgs scenario provides us a new solution for the hierarchy and fine tuning problem of the Standard Model. Furthermore, the Littlest Higgs model with T-parity, which is one of models in this scenario, solves the dark matter problem in our universe. The model predicts existence of a new vector-like quark, in addition of a whole spectrum of heavy particles including the dark matter. In this talk, we discuss the phenomenology of the little Higgs model, focusing on the collider signature of this new vector-like quark at the CERN LHC experiment