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Dark matter versus h → γγ and h → γ Z with supersymmetric triplets

Abstract : The Triplet extension of the MSSM (TMSSM) alleviates the little hierarchy problem and provides a significant enhancement of the loop-induced diphoton rate of the lightest CP-even Higgs h. In this paper we pursue the analysis of the TMSSM Higgs phenomenology by computing for the first time the h → Zγ decay. Interestingly we find that the rates of loop-induced decays are correlated and their signal strengths can rise up to 40%-60% depending on the channel. We furthermore study the dark matter phenomenology of the TMSSM. The lightest neutralino is a good dark matter candidate in two regions. The first one is related to the Higgs and Z resonances and the LSP is mostly Bino. The second one is achieved for a mass larger than 90 GeV and the LSP behaves as the well-tempered neutralino. An advantage of the triplet contribution is that the well-tempered neutralino can be a Bino-Triplino mixture, relieving the problem of achieving M 2 ~ M 1 in unified scenarios. The dark matter constraints strongly affect the Higgs phenomenology, reducing the potential enhancements of the diphoton and of the Zγ channels by 20% at most. In the near future, dark matter direct searches and collider experiments will probe most of the parameter space where the neutralino is the dark matter candidate.
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Submitted on : Tuesday, April 19, 2022 - 3:47:47 PM
Last modification on : Wednesday, April 20, 2022 - 3:40:09 AM

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Chiara Arina, Víctor Martín-Lozano, Germano Nardini. Dark matter versus h → γγ and h → γ Z with supersymmetric triplets. Journal of High Energy Physics, 2014, 2014, ⟨10.1007/JHEP08(2014)015⟩. ⟨insu-03645340⟩

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