Funnel annihilations of light dark matter and the invisible decay of the Higgs boson

Kun Wang; Jingya Zhu

doi:10.1103/PhysRevD.101.095028

paper

Funnel annihilations of light dark matter and the invisible decay of the Higgs boson

arXiv:2003.01662 · doi:10.1103/PhysRevD.101.095028

Abstract

The semi-constrained NMSSM (scNMSSM), or NMSSM with non-universal Higgs masses, can naturally predict a light dark matter under current constraints including Higgs data, sparticle-mass bounds, dark matter searches, and muon g-2, etc. In this work, we take this scenario of scNMSSM as an example to study the funnel-annihilation mechanisms of light dark matter ( $1 \sim 62$ GeV) and the invisible Higgs decay. In this scenario we found that: (i) There can be four funnel-annihilation mechanisms for the LSP $χ ~_{1}^{0}$ , which are the $h_{2}$ , $Z$ , $h_{1}$ and $a_{1}$ funnel. (ii) For the $h_{1}$ and $a_{1}$ funnel with right relic density, the $χ ~_{1}^{0}$ mass is lighter than 12 GeV, and the invisible Higgs decay can be $2%$ at most. (iii) For the $h_{2}$ and $Z$ funnel with right relic density, the invisible Higgs decay can be about $0.4%$ and $1%$ respectively at most. (iv) If the invisible Higgs decay was discovered at the HL-LHC, the four funnel-annihilation mechanisms of light dark matter may be all excluded with $χ ~_{1}^{0}$ as the only dark matter source. Four benchmark points, one for each mechanism, are proposed for future checking with updated experimental results.

arXiv commentVersion accepted by PRD, English improved

Funnel annihilations of light dark matter and the invisible decay of the Higgs boson

Abstract

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