Towards the fate of natural composite Higgs model through single t' search at the 8 TeV LHC

Abstract

We analyze the observational potential of single t ′ production in both the t ′ → bW and t ′ → th decay channels at 8 TeV LHC using an integrated luminosity of 25 fb−1. Our analysis is based on a simplified model with minimal coset SO(5)/SO(4) in which the t ′ is a singlet of the unbroken SO(4). The single t ′ production, as a consequence of electroweak symmetry breaking, is less kinematically suppressed, associated with a light forward jet and has boosted decay products at the 8 TeV LHC. Therefore it provides the most promising channel in searching for a heavy t ′ . We have exploited the above kinematical features and used the jet substructure method to reconstruct the boosted Higgs in th decay channel. It is shown that a strong constraint on the t ′ bW coupling (g t ′ bW /g tbW,SM < 0.2 ~ 0.3) at the 95% C. L. can be obtained for m t′ ⊂ (700, 1000) GeV.