Revisiting Vector-like Quark Model with Enhanced Top Yukawa Coupling

Abstract

We revisit a scenario with an enhanced top yukawa coupling in vector-like quark (VLQ) models, where the top yukawa coupling is larger than the standard model value and the lightest VLQ has a negative yukawa coupling. We find that the parameter space satisfying the LHC bounds of the Higgs signal strengths consistently with the precision measurements is rather wide. Because the Lagrangian parameters of the yukawa couplings are large, such scenario can be realized in some strongly interacting theories. It also turns out that there is a noticeable relation between the contributions of the triangle and box diagrams in the $gg\to hh$ process by using the lowest order of the $1/M$ expansion where $M$ is the heavy mass running in the loops.

21 pages, 1 table, 6 figures. Discussions of Sec.III are extended. References added. version published in PRD

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Cited by in corpus (4)

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• Search for single production of the vector-like top partner at the 14 TeV 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
• The Two Scales of New Physics in Loop-Induced Higgs Couplings