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Dear Colleagues,

Strong astrophysical and cosmological evidence on many scales indicates the existence of non-baryonic dark matter content in our Universe, which constitutes approximately 85 percent of the Universe’s matter density and 26 percent of its total energy density. Dark matter is generally believed to be new particles in new physics beyond the Standard Model, and these must be stable or have a much longer lifetime than the age of the Universe. Many theoretically well-motivated dark matter candidates have been proposed to explain the dark matter related astrophysical evidence, which possibly span an incredible mass range from 10⁻²¹ eV to above the Planck scale 10²⁷ eV. Weakly interacting massive particles (WIMPs) between 1 GeV and 100 TeV that interact with the SM particles are the most promising dark matter candidates, for example, the lightest neutralino in supersymmetric (SUSY) models. Understanding the nature of dark matter and the search for dark matter signals are the most important tasks for particle physics and cosmology today.

In this Special Issue, we will focus on both the theoretical and experimental aspects of dark matter, including new proposals/candidates to explain the dark matter puzzle, the general theory and analysis of dark matter, the direct and indirect detections of dark matter particles, the constraints of DM from colliders, the connection of the DM to baryon asymmetry, dark matter related phenomenology, etc.

Prof. Dr. Fei Wang
Guest Editor

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Research

12 pages, 1727 KiB

Open AccessArticle

The Phenomenological Research on Higgs and Dark Matter in the Next-to-Minimal Supersymmetric Standard Model

by Zhaoxia Heng, Shenshen Yang, Xingjuan Li and Liangliang Shang

Symmetry 2023, 15(2), 456; https://doi.org/10.3390/sym15020456 - 8 Feb 2023

Cited by 2 | Viewed by 1357

Abstract

The

Z_{3}

The

Z_{3}

-invariant next-to-minimal supersymmetric standard model (NMSSM) can provide a candidate for dark matter (DM). It can also be used to explain the hypothesis that the Higgs signal observed on the Large Hadron Collider (LHC) comes from the contribution of the two lightest CP-even Higgs bosons, whose masses are near 125 GeV. At present, XENON1T, LUX, and PandaX experiments have imposed very strict restrictions on direct collision cross sections of dark matter. In this paper, we consider a scenario that the observed Higgs signal is the superposition of two mass-degenerate Higgs in the

Z_{3}

-invariant NMSSM and scan the seven-dimension parameter space composing of

λ, κ, tan β, μ, A_{k}, A_{t}, M_{1}

via the Markov chain Monte Carlo (MCMC) method. We find that the DM relic density, as well as the LHC searches for sparticles, especially the DM direct detections, has provided a strong limit on the parameter space. The allowed parameter space is featured by a relatively small

μ \leq 300

GeV and about

tan β \in (10, 20)

. In addition, the DM is Higgsino-dominated because of

| \frac{2 κ}{λ} | > 1

. Moreover, the co-annihilation between

{\tilde{χ}}_{1}^{0}

and

{\tilde{χ}}_{1}^{\pm}

must be taken into account to obtain the reasonable DM relic density. Full article

(This article belongs to the Special Issue Symmetry in Dark Matter and Cosmology)

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