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MiniBooNE反常与重中微子衰变

The MiniBooNE anomaly and heavy neutrino decay

S. N. Gninenko

备注：
version accepted for publication in Phys. Rev. Lett
发表信息：
Phys.Rev.Lett.103:241802,2009
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摘要：

讨论了MiniBooNE合作组报道的准弹性中微子事件低能分布的异常。我们发现，所观察到的过量的类电子事件可能源于在MiniBooNE探测器中的重中微子（$ν_h$）的产生和衰变。$ν_h$是通过在$ν_μ$中性流相互作用中混合而产生的，并且由于$ν_h$和轻中微子$ν$之间的跃迁磁矩而辐射衰变为$ νγ$。在探测器中测量的能量来自于随后在探测器体积内将衰变光子转换成$\pair$对。过剩事件的能量和角分布的分析表明，$ν_h$的质量约为500 MeV和寿命$τ_{ν_h} \lesssim 10^{-9}$ s。现有的实验数据被发现是一致的$ν_h$和$ν_μ$的$|U_{μh}|^2 \simeq (1-4)\times 10^{-3}$和一个$ν_h$过渡磁矩的$ μ_{tr} \simeq (1- 6)\times 10^{-9} μ_B$之间的混合强度。最后，我们讨论了为什么没有显着过剩的低能量事件已被观察到在最近的反中微子数据。

英文摘要：

The anomaly in the low energy distribution of quasi-elastic neutrino events reported by the MiniBooNE collaboration is discussed. We show that the observed excess of electron-like events could originate from the production and decay of a heavy neutrino ($ν_h$) in the MiniBooNE detector. The $ν_h$ is created by mixing in $ν_μ$ neutral-current interactions and decays radiatively into $ νγ$ due to a transition magnetic moment between the $ν_h$ and a light neutrino $ν$. The energy measured in the detector arises from the subsequent conversion of the decay photon into a $\pair$ pair within the detector volume. The analysis of the energy and angular distributions of the excess events suggests that the $ν_h$ has a mass around 500 MeV and the lifetime $τ_{ν_h} \lesssim 10^{-9}$ s. Existing experimental data are found to be consistent with a mixing strength between the $ν_h$ and the $ν_μ$ of $|U_{μh}|^2 \simeq (1-4)\times 10^{-3}$ and a $ν_h$ transition magnetic moment of $ μ_{tr} \simeq (1- 6)\times 10^{-9} μ_B$. Finally, we discuss the reason why no significant excess of low energy events has been observed in the recent antineutrino data.

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