T-odd top partner pair production in the dilepton final states at the LHC in the littlest Higgs Model with T-parity

Abstract

In the littlest Higgs Model with T-parity, we discuss the pair production of the T-odd top partner ($T_{-}$) which decays almost 100\% into the top quark and the lightest T-odd particle ($A_H$). Considering the current constraints, we investigate the observability of the T-odd top partner pair production through the process $pp\to T_{-}{\bar{T}}_{-}\to t\bar{t}{A}_H{A}_H$ in final states with two leptons at 14 TeV LHC. We analyze the signal significance and find that the lower limit on the T-odd top partner mass are about 1.04 TeV, 1.14 TeV, 1.23 TeV at $2\ddot{I}ƒ$ confidence level at 14TeV LHC with the integrated luminosity of 30 fb${}^{-1}$, 100fb${}^{-1}$, 300fb${}^{-1}$. This lower limit can be raised to about 1.34(1.44) TeV if we use 1000(3000) fb${}^{-1}$ of integrated luminosity.

typos corrected, calculations and results are updated. arXiv admin note: text overlap with arXiv:1706.02821