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arXiv 1702.01758hep-ph
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费米实验室短基线中微子装置上的光无菌中微子振荡和CP破坏研究展望

Prospects of Light Sterile Neutrino Oscillation and CP Violation Searches at the Fermilab Short Baseline Neutrino Facility

Davio Cianci, Andy Furmanski, Georgia Karagiorgi, Mark Ross-Lonergan

摘要:

我们研究了费米实验室的短基线中微子(SBN)实验计划对全球允许的(3+ $N$)无菌中微子振荡参数空间的检验能力。我们明确地考虑了(3+1)、(3+2)和(3+3)无菌中微子振荡情形的全局允许参数空间。我们发现,对于(3+1)、(3+2)和(3+3)方案,SBN可以探测到的$5σ$灵敏度分别超过目前允许的参数空间的85%、95%和55%,置信度分别为99%.在(3+2)和(3+3)两种情况下,CP破坏相出现在振荡概率项中,导致中微子和反中微子出现概率的显著差异。我们探讨SBN的敏感性,这些阶段的(3+2)的情况下,通过目前计划的中微子束运行,并调查潜在的改进,通过额外的反中微子束运行。我们表明,如果考虑反中微子曝光,对于(3+2)CP破坏相$ϕ_{54}$的最大值,SBN可能是第一个直接观察到与扩展轻子扇区相关的CP破坏的$\sim 2σ$暗示的实验。

英文摘要:

We investigate the ability of the Short Baseline Neutrino (SBN) experimental program at Fermilab to test the globally-allowed (3+$N$) sterile neutrino oscillation parameter space. We explicitly consider the globally-allowed parameter space for the (3+1), (3+2), and (3+3) sterile neutrino oscillation scenarios. We find that SBN can probe with $5σ$ sensitivity more than 85\%, 95\% and 55\% of the parameter space currently allowed at 99\% confidence level for the (3+1), (3+2) and (3+3) scenarios, respectively. In the case of the (3+2) and (3+3) scenarios, CP-violating phases appear in the oscillation probability terms, leading to observable differences in the appearance probabilities of neutrinos and antineutrinos. We explore SBN's sensitivity to those phases for the (3+2) scenario through the currently planned neutrino beam running, and investigate potential improvements through additional antineutrino beam running. We show that, if antineutrino exposure is considered, for maximal values of the (3+2) CP-violating phase $ϕ_{54}$, SBN could be the first experiment to directly observe $\sim 2σ$ hints of CP violation associated with an extended lepton sector.

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