Higgs couplings and Naturalness in the littlest Higgs model with T-parity at the LHC and TLEP

Abstract

Motivated by the recent LHC Higgs data and null results in searches for any new physics, we investigate the Higgs couplings and naturalness in the littlest Higgs model with T-parity. By performing the global fit of the latest Higgs data, electroweak precise observables and $R_b$ measurements, we find that the scale $f$ can be excluded up to 600 GeV at $2\sigma$ confidence level. The expected Higgs coupling measurements at the future collider TLEP will improve this lower limit to above 3 TeV. Besides, the top parnter mass $m_{T_{+}}$ can be excluded up to 880 GeV at $2\sigma$ confidence level. The future HL-LHC can constrain this mass in the region $m_{T_{+}}<2.2$ TeV corresponding to the fine-tuning being lager than 1%.

published version (to appear in JHEP)

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• Lepton flavor violation in the Littlest Higgs Model with T parity realizing an inverse seesaw
• Associated production of single top and Higgs at the LHC in the littlest Higgs model with T-parity
• Higgs-Precision Constraints on Colored Naturalness
• Little Higgs Dark Matter after PandaX-II/LUX 2016 and LHC Run-1
• Lepton Flavour Violation in Hadron Decays of the Tau Lepton within the Littlest Higgs Model with T-parity