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arXiv 1703.04438hep-ph
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用Fermilab中微子束研究ORCA的质量分级和CP相位灵敏度

Mass hierarchy and CP-phase sensitivity of ORCA using Fermilab Neutrino Beam

Ushak Rahaman, Soebur Razzaque

摘要:

我们探索中微子质量等级的确定和CP相位测量使用多兆吨水切伦科夫探测器KM 3 NeT振荡研究与宇宙在深渊(ORCA)在地中海接收中微子束从费米实验室长基线中微子设施(LBNF)超过6900公里的基线。我们发现,与建议的光束亮度$1.2\times 10^{21}$质子对目标每年,它将有可能确定质量等级在$\gtrsim 4\,σ$置信水平在1年内的中微子模式。在中微子模式下的1年和在反中微子模式下的1年的组合可以确定$\gtrsim 6\,σ$置信水平的等级。我们还发现,一个非零CP-阶段可以检测到$\sim 1.8\,σ$显着性后,10年的数据。我们探讨了中微子振荡参数的简并性和影响结果的探测效率的不确定性。

英文摘要:

We explore neutrino mass hierarchy determination and CP-phase measurement using multi-megaton water Cherenkov detector KM3NeT-Oscillation Research with Cosmics in the Abyss (ORCA) in the Mediterranean sea receiving neutrino beam from the Fermilab Long Baseline Neutrino Facility (LBNF) over 6900 km baseline. We find that with the proposed beam luminosity of $1.2\times 10^{21}$ proton-on-target per year, it will be possible to determine mass hierarchy at $\gtrsim 4\,σ$ confidence level within 1 year in the neutrino mode alone. A combined 1 year in neutrino and 1 year in antineutrino mode can determine hierarchy at $\gtrsim 6\,σ$ confidence level. We also find that a non-zero CP-phase can be detected with up to $\sim 1.8\,σ$ significance after 10 years of data taking. We explore degeneracy of neutrino oscillation parameters and uncertainties in detection efficiencies affecting the results.

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