Constraining Top partner and Naturalness at the LHC and TLEP
Chengcheng Han, Archil Kobakhidze, Ning Liu, Lei Wu, Bingfang Yang
TL;DR
This paper uses global fits of Higgs data, B_s decay, and electroweak measurements to set indirect constraints on top partner masses, showing they are excluded up to 830 GeV and will be further constrained by future Higgs measurements.
Contribution
It provides the strongest indirect bounds on top partner mass using current data and forecasts future constraints from Higgs coupling measurements at TLEP.
Findings
Top partner mass up to 830 GeV excluded at 2σ
Current constraints imply less than 9% fine-tuning
Future TLEP measurements can probe multi-TeV top partner masses
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, measurements and the electroweak precision observables we find that the top partner with the mass up to 830 GeV is excluded at 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 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.
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