Abstract
It was shown recently that, in two Higgs doublet models without Z2 symmetry, extra Yukawa couplings such as ρtc, ρtt can fuel enough CP violation for electroweak baryogenesis (EWBG). We revisit an old proposal where a pseudoscalar A0 has mass between tc¯ and tt¯ thresholds. With ρtt small, it evades gg→A0→h0(125)Z constraints, where approximate alignment also helps. We find this scenario with relatively light A0 is not yet ruled out, and cg→tA0→ttc¯ can probe sizable ρtc at the LHC, giving access to the second mechanism of EWBG provided by such models.
Highlights
It was shown recently that, in two Higgs doublet models without Z2 symmetry, extra Yukawa couplings such as ρtc, ρtt can fuel enough CP violation for electroweak baryogenesis (EWBG)
Discussion and Conclusion.— In a previous work [8], we have studied same-sign dilepton and triple top signatures that arise from cg → tA0, tH0 → ttc, ttt, where mS0 > 2mt (S0 = H0, A0) was assumed
There was an implicit expectation that the case for A0 below ttthreshold is likely ruled out already
Summary
It was shown recently that, in two Higgs doublet models without Z2 symmetry, extra Yukawa couplings such as ρtc, ρtt can fuel enough CP violation for electroweak baryogenesis (EWBG). We survey existing LHC data pertaining to the SS2 signature to constrain ρtc, study the discovery/exclusion potential at the LHC.
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