Freeze-in sterile neutrino dark matter in a feebly gauged $B-L$ model
Fuente:
arXiv
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915295855116288 |
|---|---|
| author | Seto, Osamu Shimomura, Takashi Uchida, Yoshiki |
| author_facet | Seto, Osamu Shimomura, Takashi Uchida, Yoshiki |
| contents | We consider the gauged $U(1)_{B-L}$ model and examine the situation where the sterile neutrino is a dark matter candidate produced by the freeze-in mechanism. In our model, the dark matter $N$ is mainly produced by the decay of a $U(1)_{B-L}$ breaking scalar boson $ϕ$. We point out that the on-shell production of $ϕ$ through annihilation of the $U(1)_{B-L}$ gauge boson $Z'$ plays an important role. We find that the single production of $Z'$ from the gluon bath in the early Universe can become the main production modes for $Z'$ in some parameter regions. To prevent $N$ from being overproduced, we show that the $U(1)_{B-L}$ gauge coupling constant $g_{B-L}$ must be as small as $10^{-16}$--$10^{-10}$. We also consider the case where the decay of $ϕ$ into $N$ is kinematically forbidden. In this case, $N$ is generated by the scattering of $Z'$ and the $g_{B-L}$ takes values of $10^{-10}$--$10^{-6}$, which can be explored in collider experiments like FASER and SHiP. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_00654 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Freeze-in sterile neutrino dark matter in a feebly gauged $B-L$ model Seto, Osamu Shimomura, Takashi Uchida, Yoshiki High Energy Physics - Phenomenology We consider the gauged $U(1)_{B-L}$ model and examine the situation where the sterile neutrino is a dark matter candidate produced by the freeze-in mechanism. In our model, the dark matter $N$ is mainly produced by the decay of a $U(1)_{B-L}$ breaking scalar boson $ϕ$. We point out that the on-shell production of $ϕ$ through annihilation of the $U(1)_{B-L}$ gauge boson $Z'$ plays an important role. We find that the single production of $Z'$ from the gluon bath in the early Universe can become the main production modes for $Z'$ in some parameter regions. To prevent $N$ from being overproduced, we show that the $U(1)_{B-L}$ gauge coupling constant $g_{B-L}$ must be as small as $10^{-16}$--$10^{-10}$. We also consider the case where the decay of $ϕ$ into $N$ is kinematically forbidden. In this case, $N$ is generated by the scattering of $Z'$ and the $g_{B-L}$ takes values of $10^{-10}$--$10^{-6}$, which can be explored in collider experiments like FASER and SHiP. |
| title | Freeze-in sterile neutrino dark matter in a feebly gauged $B-L$ model |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2404.00654 |