Year: 2026
Type: article
Abstract: A bstract In the conventional Z ′ portal dark matter scenario, the prediction of detectable dark matter χ typically relies on the collider sensitivities of Z ′ and direct detection, where the Majorana type right-handed neutrinos are usually assumed. However, if the right-handed neutrinos ν R are Dirac type, they will contribute to the additional effective number of relativistic species ∆ N eff , which brings different detectable predictions for Z ′ portal dark matter. In light of the great improvement of ∆ N eff for the upcoming experiments, we investigate the Z ′ portal dark matter with Dirac type ν R . Under the U (1) B − L symmetry, this model includes ν R with U (1) B − L charge $$ {Q}_{\nu_R} $$ Q ν R = −1 and χ with arbitrary Q χ beyond the SM. Based on the relation in the production of χ and ν R , both the WIMP and FIMP dark matter through the Z ′ portal scenario are considered. We perform a comprehensive exploration of the viable parameter space under the constraints from ∆ N eff induced by thermal and non-thermal ν R , perturbative limit, dark matter direct and indirect detection, and collider searches of Z ′ .
Source: Journal of High Energy Physics
Authors: Ang Liu, Zhi-Long Han, Fei Huang
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G3342086942, G8518482887
OpenAlex ID: W7221793260