标题： 在SHiP实验中探测3+1中微子模型 显示英文标题

标题： Probing the 3+1 neutrino model in the SHiP experiment

摘要： 在这项研究中，作为我们之前工作的延伸，我们利用带电当前深部非弹性散射事例谱，估算了寻找隐藏粒子（SHiP）实验对3+1模型的灵敏度。 我们采用Feldman-Cousins方法并结合参数化引导抽样来处理无关参数和系统不确定性。 在之前的研究中，我们通过建议远近SND（FSND和NSND）分别位于120米和27米处，提出了双基准线的方法。本研究也采用了相同的方法。 NSND-only配置可以探测接近$\Delta m_{41}^2 \sim 10^3\,\mathrm{eV}^2$附近的$|U_{\alpha4}|^2 \gtrsim 0.1$混合参数，归一化系统不确定度从20%减少到10%，从而灵敏度提高大约两倍。 此外，FSND的加入显著提高了灵敏度，提高幅度在2到10倍之间，具体取决于味道和系统不确定性。 在两种味道混合场景中，中微子出现和消失之间的抵消在灵敏度曲线中产生了拐点，而在双基准线方法中这些拐点消失了。 显示英文摘要

摘要： In this study, as an extension of our previous work, we estimate the sensitivity of the Search for Hidden Particles (SHiP) experiment to the 3+1 model using the charged-current deep inelastic scattering event spectrum. We employ the Feldman-Cousins method with a parametric bootstrap to account for nuisance parameters and systematic uncertainties. In the previous study, we proposed a dual baseline approach by suggesting Far SND (FSND) at 120 m with Near SND (NSND) at 27 m. We employ the same approach in this study. The NSND-only configuration can probe mixing parameters of $|U_{\alpha4}|^2 \gtrsim 0.1$ near $\Delta m_{41}^2 \sim 10^3\,\mathrm{eV}^2$, with a reduction of normalized systematic uncertainties from 20\% to 10\% improving sensitivity by roughly a factor of two. Moreover, the inclusion of FSND significantly enhances the sensitivity by a factor of 2 to 10 depending on the flavor and the systematic uncertainty. In two-flavor mixing scenarios, a cancellation between neutrino appearance and disappearance generates kinks in the sensitivity curves, that are vanished in the dual-baseline approach.