论文标题
大气中微子实验中的振荡倾斜到振荡谷
From oscillation dip to oscillation valley in atmospheric neutrino experiments
论文作者
论文摘要
大气中微子实验可以显示数据中的“振荡倾角”功能，因为它们对大$ l/e $范围的敏感性。在可以区分中微子和抗肿瘤（例如Ino）的实验中，可以在这两个通道中分别观察到振荡下降。我们提出了采用数据驱动方法的浸入识别算法 - 一种在向上和向下进行的事件中使用不对称的方法，在重建的$ l/e $ muons中进行了键入 - 证明了浸入，这将确认振动假设。我们首次提出了重建（$e_μ$，$ \，\cosθ_μ$）平面中“振荡谷”的识别，对于具有出色的MUON能量和方向分辨率等探测器可行。我们说明这个二维山谷将如何提供清晰的视觉表示和测试，并测试$ l/e $依赖性，即量化大气质量方相差的山谷的对齐方式。由于INO的ICAL检测器的充电识别能力，我们始终使用$μ^{ - } $和$μ^{+} $事件分别提出结果。考虑到统计波动和系统错误，以及当前允许范围的振荡参数的变化，我们估计，使用我们的程序在ICAL上使用10年模拟数据确定大气中微子振荡参数的精度。
Atmospheric neutrino experiments can show the "oscillation dip" feature in data, due to their sensitivity over a large $L/E$ range. In experiments that can distinguish between neutrinos and antineutrinos, like INO, oscillation dips can be observed in both these channels separately. We present the dip-identification algorithm employing a data-driven approach -- one that uses the asymmetry in the upward-going and downward-going events, binned in the reconstructed $L/E$ of muons -- to demonstrate the dip, which would confirm the oscillation hypothesis. We further propose, for the first time, the identification of an "oscillation valley" in the reconstructed ($E_μ$,$\,\cosθ_μ$) plane, feasible for detectors like ICAL having excellent muon energy and direction resolutions. We illustrate how this two-dimensional valley would offer a clear visual representation and test of the $L/E$ dependence, the alignment of the valley quantifying the atmospheric mass-squared difference. Owing to the charge identification capability of the ICAL detector at INO, we always present our results using $μ^{-}$ and $μ^{+}$ events separately. Taking into account the statistical fluctuations and systematic errors, and varying oscillation parameters over their currently allowed ranges, we estimate the precision to which atmospheric neutrino oscillation parameters would be determined with the 10-year simulated data at ICAL using our procedure.
