Novel Higgs-to-125 GeV Higgs boson decays in the complex NMSSM

Abstract

In the Next-to-Minimal Supersymmetric Standard Model (NMSSM) a variety of parameter configurations yields a Higgs boson consistent with the one observed at the LHC. Additionally, the Higgs sector of the model can contain explicit CP-violating phases even at the tree level, in contrast with the Minimal Supersymmetric Standard Model (MSSM). In this article we present the one-loop Higgs boson mass matrix of the complex NMSSM in the renormalisation-group-improved effective potential approach. We also present the trilinear Higgs boson self-couplings as well as various partial decay widths of a generic CP-mixed Higgs boson in the model. We then analyse a very interesting phenomenological scenario wherein the decay of a relatively light pseudoscalar-like Higgs boson into ~ 125 GeV SM-like Higgs boson(s) is induced by non-zero CP-violating phases. We discuss in detail a few benchmark cases in which such a decay can contribute significantly to the production of SM-like Higgs bosons at the LHC on top of the gluon fusion process. It can thus be partially responsible for the gamma.gamma excess near 125 GeV due to the subsequent decay of the SM-like Higgs boson. Such a scenario is extremely difficult to realize in the complex MSSM and, if probed at the LHC, it could provide an indication of the non-minimal nature of supersymmetry.

33 pages, 3 figures. Some improvements in text. Version to appear in PRD

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• Discovery Prospects for NMSSM Higgs Bosons at the High-Energy Large Hadron Collider
• The Higgs mass in the CP violating MSSM, NMSSM, and beyond
• Exploring the CP-violating NMSSM: EDM Constraints and Phenomenology
• On-Shell neutral Higgs bosons in the NMSSM with complex parameters
• Two Higgs bosons near 125 GeV in the NMSSM: beyond the narrow width approximation
• Next-to-Leading Order NMSSM Decays with CP-odd Higgs Bosons and Stops
• Higgs-strahlung production process e^+ e^- \to Z h at the future Higgs factory in the Minimal Dilaton Model
• A New Tool for the study of the CP-violating NMSSM
• Dark Matter in the CP-violating NMSSM
• Two Higgs bosons near 125 GeV in the complex NMSSM and the LHC Run-I data
• Lightest Higgs boson decays $h\to MZ$ in the $\mu$ from $\nu$ supersymmetric standard model
• Prospects for Higgs boson and new scalar resonant production searches in ttbb final state at the LHC