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, $B_s\to {\mu }^{+}{\mu }^{-}$ measurements and the electroweak precision observables we find that the top partner with the mass up to 830 GeV is excluded at $2\sigma$ 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 $T\to tZ$ 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.

16 pages, references and discussions added

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Cited by in corpus (12)

• Top Partner Discovery in the $T\to tZ$ channel at the LHC
• Search for single production of the vector-like top partner at the 14 TeV LHC
• Impact of top-Higgs couplings on di-Higgs production at future colliders
• Search for single production of the heavy vectorlike $T$ quark with $T\to th$ and $h\to \gamma \gamma$ at the high-luminosity LHC
• Search for single production of a top quark partner via the $T\to th$ and $h\to W{W}^{\ast }$ channels at the LHC
• Higgs couplings and Naturalness in the littlest Higgs model with T-parity at the LHC and TLEP
• Broad toplike vector quarks at LHC and HL-LHC
• Discovery potential for $T^{\prime }\to tZ$ in the trilepton channel at the LHC
• Single production of vector-like top partner decaying to $Wb$ in the leptonic channel at $ep$ colliders in the LHT model
• Polarization of top quark in vector-like quark decay
• Probing a new decay of vector-like top partner mediated by heavy Majorana neutrino via single production
• Search for the singlet vector-like top quark in the $T\to tZ$ channel with $Z\to \nu \bar{\nu }$ at hadron colliders