在ESSnuSB上探索大气中微子振荡
Exploring atmospheric neutrino oscillations at ESSnuSB
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中文总结 AI 辅助
本研究分析ESSnuSB远探测器的大气中微子振荡，利用两台总靶质量540kt的水切伦科夫探测器10年取数，给出质量排序、θ₂₃八分体等的置信区间，验证了其质量排序和八分体排除能力，与加速器中微子计划互补。
中文摘要 AI 辅助
本研究针对ESSnuSB（欧洲散裂源中微子超束）远探测器装置开展大气中微子振荡分析。在标准三味振荡情形下，探究了两台总靶质量为540千吨的圆柱形水切伦科夫探测器在10年取数期内的研究前景。本文给出了质量排序、θ₂₃八分体判定的置信区间，以及sin²θ₂₃和|Δm₃₁²|的测量精度。结果表明，无论中微子真实质量排序如何，仅需4年（10年）即可在3σ置信水平（5σ置信水平）上区分质量排序。相应地，当中微子真实质量排序为正序（倒序）时，可在4年（8年）后以3σ置信水平排除错误的θ₂₃八分体。本研究结果与ESSnuSB项目中的加速器中微子研究计划形成互补。
英文摘要
This study provides an analysis of atmospheric neutrino oscillations at the ESSnuSB far detector facility. The prospects of the two cylindrical Water Cherenkov detectors with a total fiducial mass of 540 kt are investigated over 10 years of data taking in the standard three-flavor oscillation scenario. We present the confidence intervals for the determination of mass ordering, $θ_{23}$ octant as well as for the precisions on $\sin^2θ_{23}$ and $|Δm_{31}^2|$. It is shown that mass ordering can be resolved by $3σ$ CL ($5σ$ CL) after 4 years (10 years) regardless of the true neutrino mass ordering. Correspondingly, the wrong $θ_{23}$ octant could be excluded by $3σ$ CL after 4 years (8 years) in the case where the true neutrino mass ordering is normal ordering (inverted ordering). The results presented in this work are complementary to the accelerator neutrino program in the ESSnuSB project.
