In a framework of the Standard Model (SM) simply extended by an SU(2) doublet (X,T) including a vectorlike X-quark (VLQ-X), with electric charge |QX|=5/3, we investigate the single production of the VLQ-X induced by the couplings between the VLQ-X with the first and the third generation quarks at the Large Hadron Collider (LHC) operating at s=14 TeV. The signal is searched in events including same-sign dileptons (electrons or muons), one b-tagged jet and missing energy, where the X quark is assumed to decay into a top quark and a W boson, both decaying leptonically. After a rapid simulation of signal and background events, the 95% CL exclusion limits and the 5σ discovery reach are respectively obtained at the LHC with an integrated luminosity of 300 and 3000 fb−1, respectively.
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