The two-Higgs-doublet modelas an explanation for the muon (g−2) discrepancy

University essay from Lunds universitet/Teoretisk partikelfysik

Abstract: The general Z2-violating two-Higgs-doublet model (2HDM) is analysed as an explanation for the discrepancy between Standard Model predictions and experimental measurements of the muon anomalous magnetic dipole moment ∆aµ, with the condition that it does not provide an electron electric dipole moment |eEDM| larger than experimental bounds. Several point studies of individual 2HDM parameter space points are made to show large-scale cancellation among Barr-Zee 2-loop contributions to |eEDM| at large Yukawa lepton sector magnitudes, as well as an approximately linear growth of total aµ contribution when those magnitudes are rescaled by a common factor, reaching the same order as ∆aµ. These point studies show that diagonally enhanced Yukawa couplings in the 2HDM could be an explanation for ∆aµ without violating experimental bounds on |eEDM|.

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