结合大气中微子实验对中微子质量顺序为正序的证据
Evidence for Normal Neutrino Ordering with Combined Atmospheric Neutrino Experiments
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中文总结 AI 辅助
本研究结合Super-Kamiokande、IceCube-DeepCore与KM3NeT/ORCA的大气中微子数据进行联合分析，精确约束了振荡参数，以99.95%置信度排除中微子质量倒序，提供正序的证据。
中文摘要 AI 辅助
我们对来自Super-Kamiokande（含钆相之前所有数据采集阶段）、IceCube-DeepCore以及KM3NeT/ORCA的6个探测单元配置的最新公开大气中微子数据进行了联合分析。我们的拟合同时使用所有事例样本，将实验间共享的系统不确定性视为完全相关，而探测器响应不确定性则针对每个实验独立建模。联合数据将大气振荡参数约束为Δm²₃₁ = 2.44⁺⁰·⁰⁶₋₀·⁰⁴ × 10⁻³ eV²，sin²θ₂₃ = 0.52⁺⁰·⁰³₋₀·⁰⁴，精度分别为2.2%和6.1%，与当前基于加速器的测量结果具有竞争力，且独立将CP破坏相约束为δ_CP = 1.30⁺⁰·²⁴₋₀·²⁸ π。最后，对比中微子质量谱的顺序，我们发现对正序的偏好为Δχ² = 11.0；经伪实验进一步校准后，我们以99.95%的置信水平（3.3σ）排除了倒序。
英文摘要
We present a combined analysis of the latest publicly available atmospheric neutrino data from Super-Kamiokande including all data-taking stages previous to the gadolinium phase, IceCube-DeepCore, and the six-detection-unit configuration of KM3NeT/ORCA. Our fit uses all event samples simultaneously and treats the systematic uncertainties shared among experiments as fully correlated, while detector-response uncertainties are modeled independently for each experiment. %We measure The combined data constrain the atmospheric oscillation parameters to $Δm^2_{31} = 2.44^{+0.06}_{-0.04} \times 10^{-3}\,\mathrm{eV}^2$ and $\sin^2θ_{23} = 0.52^{+0.03}_{-0.04}$, with a precision of $2.2\%$ and $6.1\%$, respectively, which is competitive with current accelerator-based measurements, and independently constrain the $CP$-violating phase to $δ_{CP} = 1.30^{+0.24}_{-0.28}~π$. Finally, comparing the orderings of the neutrino mass spectrum, we find a preference for the normal ordering with $Δχ^2 = 11.0$; further calibrated with pseudoexperiments, we exclude the inverted ordering at $99.95\%$ confidence level ($3.3σ$).
发表机构
- Harvard University（哈佛大学）
- Universidade de Santiago de Compostela（圣地亚哥-德孔波斯特拉大学）
- Universidad Autónoma de Madrid（马德里自治大学）
- Durham University（杜伦大学）
机构由 AI 辅助整理，请以论文原文为准。
