更新MiniBooNE中微子振荡结果，增加数据和新的背景研究
Updated MiniBooNE Neutrino Oscillation Results with Increased Data and New Background Studies
摘要：
费米实验室的MiniBooNE实验报告了来自中微子模式下对应于靶上$18.75 \times 10^{20}$质子的数据样本中的$638.0 \pm 132.8$类电子事件（$4.8 σ$）的总过量，相对于先前公布的结果，该数据样本增加了46%，并且反中微子模式下对应于靶上$11.27 \times 10^{20}$质子。额外的统计数据使几项研究能够解决过剩来源的问题。首先，我们提供了可见光能量和出射轻子角度余弦的二维图，这可以为事件过剩模型提供有价值的输入。其次，我们测试是否可能出现的过剩从外部事件进入探测器或光子退出探测器从$π^0$衰变在两个模型独立的方式。束流计时信息显示，几乎所有的过剩都与中微子在探测器中相互作用。半径分布表明，过量分布在整个体积中，而基准体积上的更紧密切割增加了过量的重要性。我们的结论是，模型的事件过剩的基础上进入和退出光子是不受欢迎的。
英文摘要：
The MiniBooNE experiment at Fermilab reports a total excess of $638.0 \pm 132.8$ electron-like events ($4.8 σ$) from a data sample corresponding to $18.75 \times 10^{20}$ protons-on-target in neutrino mode, which is a 46\% increase in the data sample with respect to previously published results, and $11.27 \times 10^{20}$ protons-on-target in antineutrino mode. The additional statistics allow several studies to address questions on the source of the excess. First, we provide two-dimensional plots in visible energy and cosine of the angle of the outgoing lepton, which can provide valuable input to models for the event excess. Second, we test whether the excess may arise from photons that enter the detector from external events or photons exiting the detector from $π^0$ decays in two model independent ways. Beam timing information shows that almost all of the excess is in time with neutrinos that interact in the detector. The radius distribution shows that the excess is distributed throughout the volume, while tighter cuts on the fiducal volume increase the significance of the excess. We conclude that models of the event excess based on entering and exiting photons are disfavored.
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