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arXiv 1504.08112hep-ph
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辐射中微子质量与3.5 keV X射线谱线

Radiative neutrino mass and 3.5 keV X-ray line

Seungwon Baek

摘要:

本文考虑了Zee-Babu模型的一个推广,以解释中微子质量的微小性。(1)我们将原模型的轻子数对称性推广到局域$B-L$对称性。(2)我们介绍了三个狄拉克暗物质候选人的味道依赖$B-L$收费。在$B-L$自发破缺之后,一个离散的对称性$Z_6$仍然存在,这保证了暗物质的稳定性。该模型可以解释3.5 keV X射线线信号与衰减的暗物质。我们还引入了一个在SM和$U(1)_{B-L}$下都是单态的实标量场,它可以解释狄拉克费米DM的剩余丰度。如果与SM希格斯玻色子玻色子的混合很小,则它不会有助于DM的直接检测。对DM散射的主要贡献来自于$U(1)_{B-L}$规范玻色子的交换,$Z'$,并且当$Z'$质量较重($\gtrsim 10$ TeV)时被抑制在当前的实验界限以下。当单重标量质量为0.1- 10 MeV时,冷DM自相互作用可以大到足以解决模拟中的小尺度结构问题,如核心与尖点问题和大到不能倒问题。

英文摘要:

We consider an extension of Zee-Babu model to explain the smallness of neutrino masses. (1) We extend the lepton number symmetry of the original model to local $B-L$ symmetry. (2) We introduce three Dirac dark matter candidates with flavor-dependent $B-L$ charges. After the spontaneous breaking of $B-L$, a discrete symmetry $Z_6$ remains, which guarantees the stability of dark matter. Then the model can explain the 3.5 keV X-ray line signal with decaying dark matter. We also introduce a real scalar field which is singlet under both the SM and $U(1)_{B-L}$ and can explain the current relic abundance of the Dirac fermionic DMs. If the mixing with the SM Higgs boson is small, it does not contribute to DM direct detection. The main contribution to the scattering of DM off atomic nuclei comes from the exchange of $U(1)_{B-L}$ gauge boson, $Z'$, and is suppressed below current experimental bound when $Z'$ mass is heavy ($\gtrsim 10$ TeV). If the singlet scalar mass is about 0.1--10 MeV, DM self-interaction can be large enough to solve small scale structure problems in simulations with the cold DM, such as, the core-vs-cusp problem and too-big-to-fail problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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