论文标题
在大气中微子遍历地球的振荡中违反CP的分析描述
Analytical description of CP violation in oscillations of atmospheric neutrinos traversing the Earth
论文作者
论文摘要
遍布地球内部不同距离的亚gev大气中微子和抗神经酸酯的风味振荡是有关麻血CP相$δ$的有希望的信息来源。在该能量范围内，振荡非常快，远远超出了现代中微子检测器的分辨率。但是，在实验典型的能量和方位角箱上的必要平均值不会消除CP违规效果。在本文中，我们为平均振荡概率得出非常准确的分析表达式。假设球形对称地球，平均振荡概率是用两个可分析可计算的有效参数描述的。基于这些表达式，我们在此类测量中估计了CP侵略效应的最大幅度，并提出了最适合确定PMN混合矩阵中CP相值的最佳可观察物。
Flavour oscillations of sub-GeV atmospheric neutrinos and antineutrinos, traversing different distances inside the Earth, are a promising source of information on the leptonic CP phase $δ$. In that energy range, the oscillations are very fast, far beyond the resolution of modern neutrino detectors. However, the necessary averaging over the experimentally typical energy and azimuthal angle bins does not wash out the CP violation effects. In this paper we derive very accurate analytic compact expressions for the averaged oscillations probabilities. Assuming spherically symmetric Earth, the averaged oscillation probabilities are described in terms of two analytically calculable effective parameters. Based on those expressions, we estimate maximal magnitude of CP-violation effects in such measurements and propose optimal observables best suited to determine the value of the CP phase in the PMNS mixing matrix.
