Dark Matter versus h into gamma gamma and h into gamma 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 into Z + gamma 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 Z + photon channels by 20% at most. These enhancements are however larger than the MSSM ones. In the near future, complementarity of dark matter direct searches and collider experiments will be crucial to probe most of the parameter space where the neutralino is the dark matter candidate.

34 pages, 2 tables and 11 figures; this version matches the published one in JHEP

References in corpus (5)

• Dark Matter Candidates from Particle Physics and Methods of Detection
• The Well-Tempered Neutralino
• Automatic Calculation of supersymmetric Renormalization Group Equations and Self Energies
• Dark Matter Candidates - Axions, Neutralinos, Gravitinos, and Axinos
• Triplet Extended Supersymmetric Standard Model

Cited by in corpus (6)

• Multi-Lepton Signatures of the Triplet Like Charged Higgs at the LHC
• Naturality vs perturbativity, $B_s$ physics, and LHC data in triplet extension of MSSM
• Confronting SUSY models with LHC data via electroweakino production
• Natural Supersymmetry from Extra Dimensions
• t-channel dark matter at the LHC -- a whitepaper
• Stability constraints in triplet extension of MSSM