Abstract
In the framework of the littlest Higgs Model with T-parity, we discuss the top partner production at future e+e- collider. We calculate the cross sections of the top partner production processes and associated production processes of Higgs and top partner under current constraints. Then, we investigate the observability of the T-odd top partner pair production through the process e+e-→T-T¯-→tt¯AHAH in the tt¯ dilepton channel for two T-odd top partner masses mT-=603 (708) GeV at s=1.5 TeV. We analyze the signal significance depending on the integrated luminosity and find that this signal is promising at the future high energy e+e- collider.
Highlights
The discovery of the Higgs boson at the Large Hadron Collider (LHC) [1, 2] is a great step towards understanding the electroweak symmetry breaking (EWSB) mechanism
In the littlest Higgs Model with T-parity (LHT) model, the Higgs boson is constructed as a pseudo-Nambu-Goldstone particle of the broken global symmetry
In the LHT model, the Feynman diagrams of top partner production are shown in Figure 1, which proceeds through the s-channel γ and Z exchange diagrams
Summary
The discovery of the Higgs boson at the Large Hadron Collider (LHC) [1, 2] is a great step towards understanding the electroweak symmetry breaking (EWSB) mechanism. The little hierarchy problem [3, 4], which is essentially from quadratically divergent corrections to the Higgs mass parameter, still exists. The quadratic divergence contributions to Higgs boson mass from the SM top quark loop, gauge boson loops, and the Higgs self-energy are cancelled by the corresponding T-parity partners, respectively. The top partner is the most important one since it is responsible for cancelling the largest quadratically divergent correction to the Higgs mass induced by the top quark. The ATLAS and CMS collaborations have performed the searches for the vector-like top partner through the pair or single production with three final states bW, tZ, and tH and have excluded the top partner with the mass less than about 700 GeV [8,9,10].
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