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arXiv 2001.04078hep-ph
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$U(1)_{B-L}$中Dirac暗物质的Stueckelberg机制

Dirac dark matter in $U(1)_{B-L}$ with Stueckelberg mechanism

Chengcheng Han, M. L. López-Ibáñez, Bo Peng, Jin Min Yang

摘要:

本文研究了标准模型的$U(1)_{B-L}$规范推广,其中规范玻色子质量由Stueckelberg机制产生.三个右手中微子的加入抵消了规范反常,从而解释了中微子质量。一个新的狄拉克费米子可能是一个WIMP暗物质,它与SM扇区的相互作用是由新的规范玻色子介导的。假设规范耦合的微扰性达到普朗克尺度,我们发现只有共振区对暗物质丰度是可行的。在应用当前普朗克实验的$ΔN_{eff}$约束、对撞机搜索约束以及暗物质的直接探测极限之后,我们观察到暗物质的$B-L$电荷满足$|Q_χ|>0.11$。假设右手中微子在早期宇宙中与SM扇区一起热化,这样的场景可能会被计划中的CMB-S4实验所最终探测。

英文摘要:

We investigate a $U(1)_{B-L}$ gauge extension of the Standard Model (SM) where the gauge boson mass is generated by the Stueckelberg mechanism. Three right-handed neutrinos are added to cancel the gauge anomaly and hence the neutrino masses can be explained. A new Dirac fermion could be a WIMP dark matter whose interaction with the SM sector is mediated by the new gauge boson. Assuming the perturbativity of the gauge coupling up to the Planck scale, we find that only the resonance region is feasible for the dark matter abundance. After applying the $ΔN_{eff}$ constraints from the current Planck experiment, the collider search constraints as well as the dark matter direct detection limits, we observe that the $B-L$ charge of dark matter satisfies $|Q_χ|>0.11$. Such a scenario might be probed conclusively by the projected CMB-S4 experiment, assuming the right-handed neutrinos are thermalized with the SM sector in the early universe.

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