Abstract
The Next-to-Minimal Supersymmetric extension of the Standard Model (NMSSM) features extra new sources for CP violation. In contrast to the MSSM CP violation can already occur at tree level in the Higgs sector. We investigate the range of possible allowed CP-violating phases by taking into account the constraints arising from the measurements of the Electric Dipole Moments (EDMs) and the latest LHC Higgs data. Our analysis shows that large CP-violating phases, that are NMSSM-specific, are not in conflict with the EDMs. They are dominantly constrained by the Higgs data in this case. We use our results to investigate the prospects of measuring CP violation through the combined measurement of Higgs rates, on the one hand, and in observables based on CP-violating Higgs couplings to tau leptons on the other hand.
Highlights
The discovery of a Standard Model (SM)-like Higgs boson with mass around 125 GeV by the Large Hadron Collider experiments ATLAS and CMS [1, 2] represents a milestone for particle physics
The two-loop contributions stemming from CP violation in the Higgs sector at tree level, which is specific to the Next-to-Minimal SUSY model (NMSSM), can become important when the CP phases of the Minimal Supersymmetric Standard Model (MSSM)
While the previous scan focused on NMSSM regions that lead to an overall light Higgs mass spectrum with good discovery prospects for all Higgs bosons, we here cover a large part of the NMSSM parameter space
Summary
The discovery of a Standard Model (SM)-like Higgs boson with mass around 125 GeV by the Large Hadron Collider experiments ATLAS and CMS [1, 2] represents a milestone for particle physics. CP-violating phases influence the Higgs mass spectrum already at tree level in case of Higgs sector CP violation and at loop level through radiatively induced CP violation [12, 13] Some of these effects, can be explained in the CP-conserving NMSSM by choosing the parameter combinations . The one-loop corrections to the trilinear Higgs self-couplings for the CP-conserving NMSSM [15] are available and have recently been extended to include the two-loop corrections at order O(αtαs) in the approximation of vanishing external momentum in the CP-violating case [43]. It computes for the CP-conserving and CP-violating case the twoloop NMSSM Higgs boson masses at O(αtαs) and the Higgs boson widths and branching ratios including the dominant higher order corrections..
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