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Probing for Extra Top Yukawa Couplings in Light of $t\bar th(125)$ Observation
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abstract
The observation of $t\bar th(125)$ production at the Large Hadron Collider (LHC) is the first direct measurement of the top Yukawa coupling. It opens the window on an extra top Yukawa coupling, $\rho_{tt}$, from a second Higgs doublet, without a $Z_2$ symmetry to forbid flavor changing neutral Higgs couplings. We show that $t\bar th$ and Higgs property measurements at the High Luminosity LHC can constrain the ${\rm Re}\,\rho_{tt}$--${\rm Im}\,\rho_{tt}$ parameter space that could drive electroweak baryogenesis, but the $\Gamma_h$ width measurement must be considerably improved beyond current projections.
Forward citations
Cited by 2 Pith papers
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Dark Matter in the General 2HDM with Extra Top Yukawa Couplings
G2HDM plus a Z2-odd real scalar singlet yields viable top-window dark matter and six LHC benchmarks, including flavor-violating mono-top production of invisible H→SS.
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Sensitivity to $\mathcal{CP}$-violating effective couplings in the top-Higgs sector
Combining ttbar H and single-top H production at the LHC can separate the real and imaginary parts of a CP-violating top Yukawa coupling, with projected HL-LHC constraints about twice as strong as current ATLAS bounds.
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