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arXiv 2007.05513hep-phastro-ph.CO
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中微子从活跃到不育跃迁的偶极矩和XENON1T过剩

An Active-to-Sterile Neutrino Transition Dipole Moment and the XENON1T Excess

Ian M. Shoemaker, Yu-Dai Tsai, Jason Wyenberg

摘要:

在这封简短的信中,我们发现τ和不育中微子之间的磁跃迁偶极矩可以解释XENON 1 T过量事件。与普通的中微子偶极矩不同,新的无菌质量标度的引入允许天体物理边界被抑制。有趣的是,与SN 1987 A相容的最佳拟合区域意味着硼-8或CNO中微子作为源通量。我们发现,无论是$\sim$ 260 keV或在$\sim$(500 - 800)keV的质量范围内的无菌中微子能够逃避天体物理的约束,同时能够成功地解释XENON 1 T事件率。最佳拟合参数空间中的不育中微子可能对大爆炸核合成(BBN)有重要影响。我们显示的区域中,宇宙的低再热温度可能会允许BBN约束得到缓解。

英文摘要:

In this short letter, we find that a magnetic transition dipole moment between tau and sterile neutrinos can account for the XENON1T excess events. Unlike the ordinary neutrino dipole moment, the introduction of the new sterile mass scale allows for astrophysical bounds to be suppressed. Interestingly, the best-fit regions that are compatible with the SN1987A imply either boron-8 or CNO neutrinos as the source flux. We find that sterile neutrinos of either $\sim$ 260 keV or in the $\sim$(500 - 800) keV mass range are capable of evading astrophysical constraints while being able to successfully explain the XENON1T event rate. The sterile neutrino in the best fit parameter space may have significant effects on big bang nucleosynthesis (BBN). We show the region in which a low reheating temperature of the Universe may allow the BBN constraints to be alleviated.

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