论文标题
鉴于最近实验的大中微子磁矩
Large Neutrino Magnetic Moments in the Light of Recent Experiments
论文作者
论文摘要
Xenon1t实验最近报告的电子后坐力事件中的过量可以解释为Majorana Neutrinos的巨大过渡磁矩$μ__{ν_eν_μ} $。当单个组件过渡磁力磁矩将值$μ__{ν_eν_μ} \ in（1.65-3.42）\ times 10^{ - 11}μ_b$时，我们显示了这种情况的一致性。如此大的价值通常会导致不可接受的大中微子肿块。在本文中，我们表明，新的松性对称性可以解决这个问题，并通过几个示例证明这一点。我们首先复兴，然后提出一个基于$ su（2）_h $水平对称性的简化模型。由于其Lorentz结构的差异，在$ su（2）_h $对称限制中，$m_ν$消失，而$μ__{ν_eν_μ} $是非零的。我们的简化模型基于大约$ su（2）_h $，我们还推广到三个家庭$ su（3）_h $ smymmetry。分析了这些模型的对撞机和低能测试。我们还分析了ZEE1T数据对ZEE模型的含义及其扩展，它们自然会通过旋转对称机制产生带有抑制$M_ν$的大$μ__{ν_eν_μ} $，但是发现诱导的$μ__{ν_eν_μ} $不足以解释最近的数据。最后，我们提出了一种机制，可以通过诱导中微子的介质依赖性质量来逃避严格的天体物理限制对中微子磁矩的严格限制。
The excess in electron recoil events reported recently by the XENON1T experiment may be interpreted as evidence for a sizable transition magnetic moment $μ_{ν_eν_μ}$ of Majorana neutrinos. We show the consistency of this scenario when a single component transition magnetic moment takes values $μ_{ν_eν_μ} \in(1.65 - 3.42) \times 10^{-11} μ_B$. Such a large value typically leads to unacceptably large neutrino masses. In this paper we show that new leptonic symmetries can solve this problem and demonstrate this with several examples. We first revive and then propose a simplified model based on $SU(2)_H$ horizontal symmetry. Owing to the difference in their Lorentz structures, in the $SU(2)_H$ symmetric limit, $m_ν$ vanishes while $μ_{ν_eν_μ}$ is nonzero. Our simplified model is based on an approximate $SU(2)_H$, which we also generalize to a three family $SU(3)_H$-symmetry. Collider and low energy tests of these models are analyzed. We have also analyzed implications of the XENON1T data for the Zee model and its extensions which naturally generate a large $μ_{ν_eν_μ}$ with suppressed $m_ν$ via a spin symmetry mechanism, but found that the induced $μ_{ν_eν_μ}$ is not large enough to explain recent data. Finally, we suggest a mechanism to evade stringent astrophysical limits on neutrino magnetic moments arising from stellar evolution by inducing a medium-dependent mass for the neutrino.
