A Light Supersymmetric Higgs Sector Hidden by a Standard Model-like Higgs

Abstract

Extending the Higgs sector of the MSSM by triplets alleviates the little hierarchy problem and naturally allows for enhancements in the diphoton decay rate of the lightest CP-even Higgs h. In the present paper we analyze in detail the Higgs phenomenology of this theory with m_h~126 GeV. We mostly focus on a light Higgs sector where the pseudoscalar A, the next-to-lightest CP-even scalar H and the charged H^\pm Higgses are naturally at the electroweak scale. It turns out that for any value m_A > m_h there is a parameter region at small tan(beta) where the CP-even Higgs sector appears at colliders as the SM one, except for loop-induced corrections. Notably the existence of this SM-like point, which is absent in the MSSM, is shared with supersymmetric theories where there are extra singlets. We also highlight a second parameter region at small m_A and small tan(beta) where the h signal strengths, diphoton channel included, are SM-like except those of bottoms and taus which can have at most a 10-15 % splitting. Improvements in the A and H^\pm searches are worthwhile in order to discriminate this scenario from the SM.

24 pages, 6 figures; v2: added references; v3: some comments clarified, Fig.6 improved, version published in JHEP

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Cited by in corpus (8)

• Supersymmetric Custodial Triplets
• Status of $Y=0$ Triplet Higgs with supersymmetry in the light of $\sim 125$ GeV Higgs discovery
• Multi-Lepton Signatures of the Triplet Like Charged Higgs at the LHC
• Status of MSSM Higgs Sector using Global Analysis and Direct Search Bounds, and Future Prospects at the HL-LHC
• Naturality vs perturbativity, $B_s$ physics, and LHC data in triplet extension of MSSM
• Perspectives on a Supersymmetric Extension of the Standard Model with a $Y=0$ Higgs Triplet and a Singlet at the LHC
• Indirect Effect of Supersymmetric Triplets in Stop Decays
• Triplet Extended MSSM: Fine Tuning vs Perturbativity and Experiment