Testing the littlest Higgs model with T parity at the CERN Large Hadron Collider

In the framework of the littlest Higgs model with T parity (LHT), we study the production processes of T-even (T+) and T-odd (T_) partners of the top quark at the Large Hadron Collider (LHC). We show that the signal events can be distinguished from the standard model backgrounds, and that information about mass and mixing parameters of the top partners can be measured with relatively good accuracies. With the measurements of these parameters, we show that a nontrivial test of the LHT can be performed. We also discuss a possibility to reconstruct the thermal relic density of the lightest T-odd particle A(H) using the LHC results and show that the scenario where A(H) becomes dark matter may be checked.