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16 pages, 22205 KiB

Open AccessArticle

Properties of Heavy Higgs Bosons and Dark Matter Under Current Experimental Limits in the μNMSSM

by Zhaoxia Heng, Xingjuan Li and Liangliang Shang

Universe 2025, 11(3), 103; https://doi.org/10.3390/universe11030103 - 20 Mar 2025

Cited by 3 | Viewed by 225

Searches for new particles beyond the Standard Model (SM) are an important task for the Large Hadron Collider (LHC). In this paper, we investigate the properties of the heavy non-SM Higgs bosons in the

μ

-term extended Next-to-Minimal Supersymmetric Standard Model (

μ

[...] Read more.

μ

-term extended Next-to-Minimal Supersymmetric Standard Model (

μ

NMSSM). We scan the parameter space of the

μ

NMSSM considering the basic constraints from Higgs data, dark matter (DM) relic density, and LHC searches for sparticles. And we also consider the constraints from the LZ2022 experiment and the muon anomaly constraint at the 2

σ

level. We find that the LZ2022 experiment has a strict constraint on the parameter space of the

μ

NMSSM, and the limits from the DM-nucleon spin-independent (SI) and spin-dependent (SD) cross-sections are complementary. Then, we discuss the exotic decay modes of heavy Higgs bosons decaying into SM-like Higgs bosons. We find that for doublet-dominated Higgs

h_{3}

and

A_{2}

, the main exotic decay channels are

h_{3} \to Z A_{1}

h_{3} \to h_{1} h_{2}

A_{2} \to A_{1} h_{1}

, and

A_{2} \to Z h_{2}

, and the branching ratio can reach to about 23%, 10%, 35%, and 10% respectively. Full article

(This article belongs to the Special Issue Search for New Physics Through Combined Approaches)

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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 1653

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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