Z′ portal dark matter with observable ∆Neff
- 1Jining University
- 2University of Jinan
- 3Shanghai Jiao Tong University
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 QνR 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 ′ .
Related
BibTeX
@article{liu2026portal,
title = {{Z′ portal dark matter with observable ∆Neff}},
author = {Ang Liu and Zhi-Long Han and Fei Huang},
journal = {Journal of High Energy Physics},
year = {2026},
month = oct,
doi = {10.1007/jhep10(2026)119},
url = {https://link.springer.com/article/10.1007/JHEP10(2026)119},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Z′ portal dark matter with observable ∆Neff
AU - Ang Liu
AU - Zhi-Long Han
AU - Fei Huang
PY - 2026
DA - 2026/10/09
JO - Journal of High Energy Physics
DO - 10.1007/jhep10(2026)119
UR - https://link.springer.com/article/10.1007/JHEP10(2026)119
AB - 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_ν_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 ′ .
SN - 1029-8479
ER -