Conversion-Driven Dark Matter in $U(1)_{B-L}$
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866915013174755328 |
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| author | Zhang, Jing-Jing Han, Zhi-Long Liu, Ang Shao, Feng-Lan |
| author_facet | Zhang, Jing-Jing Han, Zhi-Long Liu, Ang Shao, Feng-Lan |
| contents | The new gauge boson $Z'$ in $U(1)_{B-L}$ is widely considered as the mediator of dark matter. In this paper, we propose the conversion-driven dark matter in $U(1)_{B-L}$. The dark sector contains two Dirac fermions $\tildeχ_1$ and $\tildeχ_2$ with $U(1)_{B-L}$ charge 0 and $-1$, respectively. A $Z_2$ symmetry is also introduced to ensure the stability of dark matter. The mass term $δm \bar{\tildeχ}_1\tildeχ_2$ induces the mixing of dark fermion. Then the lightest dark fermion $χ_1$ becomes the dark matter candidate, whose coupling to $Z'$ is suppressed by the mixing angle $θ$. Instead of freezing-out via pair annihilation, we show that the observed relic abundance can be obtained through the conversion processes. We then explore the feasible parameter space of conversion-driven dark matter in $U(1)_{B-L}$. Under various experimental constraints, the conversion-driven dark matter prefers the region with $3\times10^{-6}\lesssim g'\lesssim2\times10^{-4}$ and $0.02~\text{GeV}\lesssim m_{Z'}\lesssim10$~GeV, which is within the reach of future Belle II, FASER and SHiP. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_06744 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Conversion-Driven Dark Matter in $U(1)_{B-L}$ Zhang, Jing-Jing Han, Zhi-Long Liu, Ang Shao, Feng-Lan High Energy Physics - Phenomenology The new gauge boson $Z'$ in $U(1)_{B-L}$ is widely considered as the mediator of dark matter. In this paper, we propose the conversion-driven dark matter in $U(1)_{B-L}$. The dark sector contains two Dirac fermions $\tildeχ_1$ and $\tildeχ_2$ with $U(1)_{B-L}$ charge 0 and $-1$, respectively. A $Z_2$ symmetry is also introduced to ensure the stability of dark matter. The mass term $δm \bar{\tildeχ}_1\tildeχ_2$ induces the mixing of dark fermion. Then the lightest dark fermion $χ_1$ becomes the dark matter candidate, whose coupling to $Z'$ is suppressed by the mixing angle $θ$. Instead of freezing-out via pair annihilation, we show that the observed relic abundance can be obtained through the conversion processes. We then explore the feasible parameter space of conversion-driven dark matter in $U(1)_{B-L}$. Under various experimental constraints, the conversion-driven dark matter prefers the region with $3\times10^{-6}\lesssim g'\lesssim2\times10^{-4}$ and $0.02~\text{GeV}\lesssim m_{Z'}\lesssim10$~GeV, which is within the reach of future Belle II, FASER and SHiP. |
| title | Conversion-Driven Dark Matter in $U(1)_{B-L}$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2411.06744 |