Abstract
The alignment phenomenon, that the 125 GeV h0 boson so resembles the Standard Model Higgs boson, can be understood in a two Higgs doublet model without discrete symmetry. New Yukawa couplings ρtt and ρtc offer new avenues to discover the extra scalar H0 and pseudoscalar A0. We propose to search for cg→tH0, tA0 followed by H0, A0→tt¯, tc¯, where same-sign dileptons could be the harbinger, with triple-top, in the signature of three leptons plus three b-jets, as confirmation. Discovery could touch upon the origin of baryon asymmetry of the Universe.
Highlights
The alignment phenomenon, that the 125 GeV h0 boson so resembles the Standard Model Higgs boson, can be understood in a two Higgs doublet model without discrete symmetry
For usual two Higgs doublet models (2HDM), such as 2HDM II that arises with supersymmetry, this “alignment” phenomenon suggests that the second doublet Φ is rather heavy, i.e. in the decoupling limit [3]
This is because the Standard Model (SM) cross section at fb order [15] is far below σ(cg → tS0) ∼ pb level for ρtc ∼ 1, which we display in Fig. 1 for mS0 ∈ (350, 700) GeV
Summary
The alignment phenomenon, that the 125 GeV h0 boson so resembles the Standard Model Higgs boson, can be understood in a two Higgs doublet model without discrete symmetry. This is because the SM cross section at fb order [15] is far below σ(cg → tS0) ∼ pb level for ρtc ∼ 1, which we display in Fig. 1 for mS0 ∈ (350, 700) GeV. Jets processes, which have large cross sections, may contribute to background if the charge of a lepton gets misidentified (charge- or Q-flip), with probability taken as 2.2 × 10−4 [21, 22] in our analysis.
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