Single production of vectorlike quarks with charge 5/3 at the 14 TeV LHC

Abstract

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 $\left|Q_X\right|=5/3$, 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 $\sqrt{s}=14$ 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.