DAMPE squib? Significance of the 1.4 TeV DAMPE excess
DAMPE squib? Significance of the 1.4 TeV DAMPE excess
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DOI：
10.1016/j.physletb.2018.03.006
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发表时间：
2017-12
影响因子：
4.4
通讯作者：
A. Fowlie
中科院分区：
文献类型：
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作者：
A. Fowlie
我们提出了一个贝叶斯和频率论分析的DAMPE带电宇宙线的频谱。通过肉眼观察，光谱在约1 TeV处包含光谱中断，在约1.4 TeV处包含单色过剩。休息支持贝叶斯因子约10 - 10，我们认为，统计意义是响亮的。我们研究了是否应该把过量的暗物质湮灭到附近的次晕中的电子中。通过模拟1000个伪实验，我们发现局部显著性约为3.6σ，全局显著性约为2.3σ，包括二维的look-elsewhere效应。贝叶斯因子对我们的先验选择很敏感，但对我们的选择来说，它的优势大约是2。因此，虽然有趣，但目前信号的证据并不令人信服。
We present a Bayesian and frequentist analysis of the DAMPE charged cosmic ray spectrum. The spectrum, by eye, contained a spectral break at about 1 TeV and a monochromatic excess at about 1.4 TeV. The break was supported by a Bayes factor of about 10 10 and we argue that the statistical significance was resounding. We investigated whether we should attribute the excess to dark matter annihilation into electrons in a nearby subhalo. We found a local significance of about 3.6σ and a global significance of about 2.3σ, including a two-dimensional look-elsewhere effect by simulating 1000 pseudo-experiments. The Bayes factor was sensitive to our choices of priors, but favoured the excess by about 2 for our choices. Thus, whilst intriguing, the evidence for a signal is not currently compelling.