e+e−→tt¯H

Abstract

We consider a general effective Lagrangian for couplings of a Higgs boson to the top-quark to dimension-six operators including CP violation effects. Constraints on some of them are derived from the Z → bb data. We study the process e + e − → ttH to probe the nonstandard couplings. We find that at a linear collider with a c. m. energy √ s ∼ 0.5 − 1.5 TeV and a high luminosity of 10 − 1000 fb −1 , these non-standard couplings may be sensitively probed.

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Top Yukawa coupling measurement with indefiniteCPHiggs ine+e−→tt¯Ananthanarayan1, Garg2, Kim3 et al. 2014Phys. Rev. D13080View full textAdd to dashboardCite

“…It may be noted that, while Δσ depends on the details of the experimental efficiency of isolating the signal over the background, apart from detection efficiencies relevant to the final states involved, the prefactor ð σ=g t jdσ=dg t j Þ g t ¼g M t depends crucially on how the cross section depends on g t . It is easily imagined in a beyond-the-SM (BSM) scenario with multiple Higgs fields participating in electroweak symmetry breaking (EWSB), to have the functional dependence of the cross section on the Yukawa coupling different from that in the SM [24]. For example, cases with CP-mixed Higgs bosons will have a ttΦ coupling with a different Lorentz structure than that of the SM, which can complicate the dependence.…”