Shinning Light on Sterile Neutrino Portal Dark Matter from Cosmology and Collider
Ang Liu, Feng-Lan Shao, Zhi-Long Han, Yi Jin, Honglei Li

TL;DR
This paper explores how sterile neutrinos can connect dark matter and the standard model, analyzing cosmological and collider constraints on a specific dark sector scenario involving a dark scalar and fermion.
Contribution
It provides a comprehensive analysis of cosmological and collider constraints on a dark sector model with sterile neutrinos, focusing on delayed scalar decay and collider signatures.
Findings
Most parameter space with $m_N<m_W$ is accessible to future experiments.
Delayed decay of dark scalar affects cosmological observables.
Sterile neutrino can produce displaced vertices at colliders.
Abstract
Provided the dark sector consisted of a dark scalar and a dark fermion under an exact symmetry, the sterile neutrino can act as the messenger between the dark sector and standard model via the Yukawa coupling . In this paper, we focus on the specific scenario with being a FIMP dark matter. The decay width of dark scalar is doubly suppressed by the smallness of Yukawa coupling and mixing angle . The delayed decay will have a great impact on cosmological observables such as the Big Bang Nucleosynthesis, the Cosmic Microwave Background anisotropy power spectra, the effective number of relativistic neutrino species and the energetic neutrino flux. Meanwhile, the sterile neutrino can generate displaced vertex signature at colliders when . The…
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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Particle physics theoretical and experimental studies · Cosmology and Gravitation Theories
