arXiv 0709.18272007-09hep-ph

在很长的基线上探测单中微子振荡通道中的CP破坏

On detecting CP violation in a single neutrino oscillation channel at very long baselines

D. C. Latimer, J. Escamilla, D. J. Ernst

备注：: 8 pages, 9 figures; minor typos corrected
发表信息：: Phys.Rev.C76:055502,2007
DOI：: 10.1103/PhysRevC.76.055502

摘要：

我们提出了一种方法来检测CP破坏在一个单一的中微子振荡通道在很长的基线（数千公里的数量级），给定的最小质量平方差的精确知识。结果表明，CP破坏的特点是在$ν_e$- $ν_μ$外观通道，无论是在真空和物质中的峰值振荡的$L/E$的移位。事实上，物质效应在固定能量下增强了位移。我们考虑的情况下，亚GeV中微子测量与不同的基线，也有固定的基线的情况下。对于变化的基线，精确的绝对中微子通量的知识是不必要的;然而，中微子必须与反中微子区分开来。对于固定的基线，它表明，CP破坏可以区分，如果混合角$θ_{13}$是已知的。

英文摘要：

We propose a way of detecting CP violation in a single neutrino oscillation channel at very long baselines (on the order of several thousands of kilometers), given precise knowledge of the smallest mass-squared difference. It is shown that CP violation can be characterized by a shift in $L/E$ of the peak oscillation in the $ν_e$--$ν_μ$ appearance channel, both in vacuum and in matter. In fact, matter effects enhance the shift at a fixed energy. We consider the case in which sub-GeV neutrinos are measured with varying baseline and also the case of a fixed baseline. For the varied baseline, accurate knowledge of the absolute neutrino flux would not be necessary; however, neutrinos must be distinguishable from antineutrinos. For the fixed baseline, it is shown that CP violation can be distinguished if the mixing angle $θ_{13}$ were known.

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英文摘要：

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