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arXiv 0707.2285hep-ph
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中微子衰变对MiniBooNE观测的非粒子解释

Neutrino decay as a possible interpretation to the MiniBooNE observation with unparticle scenario

Xue-Qian Li, Yong Liu, Zheng-Tao Wei, Liang Tang

摘要:

MiniBooNE合作组在对中微子振荡$ν_μ\toν_e$的一项新的测量中,观测到了低能下的类电子事件,这一现象可能需要一个明显超出振荡图像的解释。我们认为重中微子$ν_2$通过跃迁过程$ν_μ\to ν_e+X$(其中$X$表示任何轻产物)衰变为轻中微子$ν_1$可能是一种自然机制。我们在这里采用的理论模型是由格奥尔基建立的非粒子场景。我们研究了两种特殊的模式$ν_μ\to ν_e+\Un$和$ν_μ\to ν_e+\barν_e+ν_e$。不幸的是,计算出来的数字太小,无法解释观察结果。此外,我们的结果与宇宙学对中微子寿命的约束以及其他小组的理论估计一致,因此我们可以得出结论,即使中微子衰变在这种情况下似乎是合理的,但它确实不是MiniBooNE合作观察到的较低能量峰的来源,应该有其他机制负责这种现象。

英文摘要:

In a new measurement on neutrino oscillation $ν_μ\toν_e$, the MiniBooNE Collaboration observes an excess of electron-like events at low energy and the phenomenon may demand an explanation which obviously is beyond the oscillation picuture. We propose that heavier neutrino $ν_2$ decaying into a lighter one $ν_1$ via the transition process $ν_μ\to ν_e+X$ where $X$ denotes any light products, could be a natural mechanism. The theoretical model we employ here is the unparticle scenario established by Georgi. We have studied two particular modes $ν_μ\to ν_e+\Un$ and $ν_μ\to ν_e+\barν_e+ν_e$. Unfortunately, the number coming out from the computation is too small to explain the observation. Moreover, our results are consistent with the cosmology constraint on the neutrino lifetime and the theoretical estimation made by other groups, therefore we can conclude that even though neutrino decay seems plausible in this case, it indeed cannot be the source of the peak at lower energy observed by the MiniBooNE collaboration and there should be other mechanisms responsible for the phenomenon.

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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