Measuring the leptonic CP phase in neutrino oscillations with nonunitary mixing
Measuring the leptonic CP phase in neutrino oscillations with nonunitary mixing
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DOI：
10.1103/physrevd.95.033005
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发表时间：
2016-05
影响因子：
5
通讯作者：
S. Ge;P. Pasquini;M. Tórtola;J. Valle
中科院分区：
文献类型：
--
作者：
S. Ge;P. Pasquini;M. Tórtola;J. Valle
非幺正中微子混合意味着一个额外的CP破坏相，可以伪造最简单的三中微子混合基准计划的轻子狄拉克CP相$\delta_{CP}$。这将阻碍在加速器型实验中探测CP破坏的可能性。我们以T2 K和T2 HK为例，说明了“标准”（或“么正”）和“非么正”CP相位之间的简并性。我们发现，在非幺正混合的假设下，它们的CP灵敏度严重恶化。幸运的是，TNT 2K建议用$\mu$DAR源补充T2（H）K，以更好地测量$\delta_{CP}$，通过探测$\mu$DAR通量的宽谱中的$\cos \delta_{CP}$和$\sin \delta_{CP}$依赖性，可以部分打破CP简并。我们还表明，进一步增加了近检测器的$\mu$DAR设置可以完全消除简并。
Non-unitary neutrino mixing implies an extra CP violating phase that can fake the leptonic Dirac CP phase $\delta_{CP}$ of the simplest three-neutrino mixing benchmark scheme. This would hinder the possibility of probing for CP violation in accelerator-type experiments. We take T2K and T2HK as examples to demonstrate the degeneracy between the "standard" (or "unitary") and "non-unitary" CP phases. We find, under the assumption of non-unitary mixing, that their CP sensitivities severely deteriorate. Fortunately, the TNT2K proposal of supplementing T2(H)K with a $\mu$DAR source for better measurement of $\delta_{CP}$ can partially break the CP degeneracy by probing both $\cos \delta_{CP}$ and $\sin \delta_{CP}$ dependences in the wide spectrum of the $\mu$DAR flux. We also show that the further addition of a near detector to the $\mu$DAR setup can eliminate the degeneracy completely.