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Search for single production of the vector-like top partner at the 14 TeV LHC

Abstract

The new heavy vector-like top partner~(TT) is one of typical features of many new physics models beyond the standard model. In this paper we study the discovery potential of the LHC for the vector-like TT-quark both in the leptonic TbWT\to bW and TtlepZlepT\to t_{\rm lep}Z_{\rm lep} (trilepton) channels at s=14\sqrt{s}= 14 TeV in the single production mode. Our analysis is based on a simplified model including a SU(2)LSU(2)_L singlet with charge 2/32/3 with only two free parameters, namely the TWbTWb coupling parameter gg^{\ast} and the top partner mass mTm_T. The 2σ2\sigma exclusion limits, 3σ3\sigma evidence and the 5σ5\sigma discovery reach in the parameter plane of gmTg^{\ast}-m_T, are, respectively, obtained for some typical integrated luminosity at the 14 TeV LHC. Finally we analyze the projected sensitivity in terms of the production cross section times branching fraction for two decay channel.Comment: 15 pages, 10 figures, 2 tables. version in EPJ

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