AI 中文总结
本文利用KM3NeT/ARCA首2年数据搜寻全天区与银道脊弥散中微子辐射，未获统计显著结果，但开发的方法为KM3NeT未来测量奠定了基础。
AI 中文摘要
本文报告对来自全天区及银道面特定区域银道脊（Galactic Ridge）的天体物理弥散中微子流的搜寻研究。该研究采用KM3NeT/ARCA首批配置（含6、8、19、21个有效探测单元）采集的数据集，对应总观测时长为640天。对于全天区分析，在单幂律假设下拟合得到的单味天体物理中微子流参数为：在68%可信水平下，归一化通量φ₀¹ᶠ=3.0⁺².¹₋₂.₀×10⁻¹⁸ GeV⁻¹·cm⁻²·s⁻¹·sr⁻¹，谱指数γ=3.00⁺⁰.³⁰₋₀.³⁵。银道脊拟合在当前灵敏度下未给出通量参数的约束，针对两项分析均推导了上限并与最新测量结果对比。尽管该数据集分析未获得统计显著结果，但所开发的方法为未来利用KM3NeT探测器开展测量提供了坚实基础。
英文摘要
We report on the search performed for a diffuse astrophysical neutrino flux from the full sky and from a specific region of the Galactic plane, the Galactic Ridge. The study uses the dataset collected with the first KM3NeT/ARCA configurations with 6, 8, 19, and 21 active detection units, corresponding to a total livetime of 640 days. For the all-sky analysis, the fitted single-flavour astrophysical neutrino flux parameters, under the single power-law assumption, are $ϕ_0^{1f} = 3.0^{+2.1}_{-2.0} \times 10^{-18}$ GeV$^{-1}$ cm$^{-2}$ s$^{-1}$ sr$^{-1}$ with spectral index $γ= 3.00^{+0.30}_{-0.35}$ at 68% credible level. The Galactic Ridge fit does not yield constraints for the flux parameters with the current sensitivity. For both analyses upper limits are derived and compared with state-of-the-art measurements. While the analysis of these datasets has not yielded statistically significant results, the developed methods provide a solid basis for future measurements with the KM3NeT detector.
Comments33 pages, 24 figures
