This content originally appeared on HackerNoon and was authored by Phenomenology Technology
Table of Links
2 Dark matter through ALP portal and 2.1 Introduction
2.3 Existing constraints on ALP parameter space
3 A two component dark matter model in a generic 𝑈(1)𝑋 extension of SM and 3.1 Introduction
3.3 Theoretical and experimental constraints
3.4 Phenomenology of dark matter
3.5 Relic density dependence on 𝑈(1)𝑋 charge 𝑥𝐻
4 A pseudo-scalar dark matter case in 𝑈(1)𝑋 extension of SM and 4.1 Introduction
4.3 Theoretical and experimental constraints
\ Appendices
D Feynman diagrams in two-component DM model
3.3 Theoretical and experimental constraints
We discuss different constraints on the model parameters such as𝑈(1)𝑋 gauge coupling and scalar mixing angle. To estimate the constraints we consider vacuum stability, perturbative unitarity, and collider searches of BSM Higgs and 𝑍′ boson respectively.
3.3.1 Vacuum Stability
The above scalar potential must be bounded from below. To determine the conditions for 𝑉(𝐻, Φ, 𝜒) to be bounded from below, we need to check the following symmetric matrix which comes from the quadratic part of the potential,
\
\ Requiring such a matrix to be positive-definite, we obtain the following conditions,
\
3.3.2 Higgs Invisible decay
\ Hence the total invisible decay width of SM Higgs boson ℎ1 is given a
\
\ Accordingly, the invisible branching ratio for ℎ1 is given b
\
\
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3.3.4 Bounds on the mixing parameter between physical mass eigenstates
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:::info This paper is available on arxiv under CC BY 4.0 DEED license.
:::
:::info Author:
(1) Shivam Gola, The Institute of Mathematical Sciences, Chennai.
:::
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This content originally appeared on HackerNoon and was authored by Phenomenology Technology
Phenomenology Technology | Sciencx (2025-02-15T03:06:41+00:00) Theoretical and Experimental Constraints: Discussing Different Constraints on the Model Parameters. Retrieved from https://www.scien.cx/2025/02/15/theoretical-and-experimental-constraints-discussing-different-constraints-on-the-model-parameters/
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