Constraining top partner and naturalness at the LHC and TLEP

Abstract

We investigate indirect constraints on the top partner within the minimal fermionic top partner model. By performing a global fit of the latest Higgs data, B s → μ + μ − measurements and the electroweak precision observables we find that the top partner with the mass up to 830 GeV is excluded at 2 σ level. Our bound on the top partner mass is much stronger than the bounds obtained from the direct searches at the LHC. Under the current constraints the fine-tuning measure is less than 9% and the branching ratio of T → t Z is bounded between 14% and 25%. We also find that precise measurements of Higgs couplings at 240 GeV TLEP will constrain the top partner mass in multi-TeV region.