θ23 octant measurement in 3+1 neutrino oscillations in T2HKK
θ23 octant measurement in 3+1 neutrino oscillations in T2HKK
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T2HKK 3+1 中微子振荡中的 θ23 八分圆测量
DOI：
10.1103/physrevd.101.075034
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发表时间：
2020
影响因子：
5
通讯作者：
Yamada Toshifumi
中科院分区：
文献类型：
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作者：
Haba Naoyuki;Mimura Yukihiro;Yamada Toshifumi
有人指出，在长基线实验中，ev尺度的无菌中微子与活性味的混合会导致对八分位数（符号）的灵敏度丧失，因为主振荡概率可以简并为中微子和反中微子振荡中与太阳振荡振幅和活性无菌振荡振幅的干扰之和，这取决于相位。在本文中，我们证明了上述简并可以通过测量不同基线长度的同一光束来解决。我们证明，tokai -to- hyper神冈-to-Korea （T2HKK）实验（一个187kt基准体积水切伦科夫探测器放置在神冈，另一个探测器放置在韩国）在神冈两个探测器实验对其不敏感的参数区域中对八分仪表现出更好的灵敏度。因此，如果在短期基线实验中发现了无菌活性混合的迹象，T2HKK是比在神冈放置两个探测器的计划更好的选择。我们还考虑了另一种情况，即一个探测器放置在神冈，另一个探测器放置在Oki群岛，并表明这种配置也导致对八分仪的更好灵敏度。
It has been pointed out that the mixing of an eV-scale sterile neutrino with active flavors can lead to a loss of sensitivity to theoctant (sign of) in long baseline experiments, because the main oscillation probabilitycan be degenerate with the sum of the interferences with the solar oscillation amplitude and an active-sterile oscillation amplitude in both neutrino and antineutrino oscillations, depending on thephases. In this paper, we show that the above degeneracy is resolved by measuring the same beam at different baseline lengths. We demonstrate that the Tokai-to-Hyper-Kamiokande-to-Korea (T2HKK) experiment (one 187 kton fiducial volume water Cerenkov detector is placed at Kamioka,, and another detector is put in Korea,) exhibits a better sensitivity to theoctant in those parameter regions where the experiment with the two detectors at Kamioka is insensitive to it. Therefore, if a hint of sterile-active mixings is discovered in short baseline experiments, T2HKK is a better option than the plan of placing two detectors at Kamioka. We also consider an alternative case where one detector is placed at Kamioka and a different detector is at Oki Islands,, and show that this configuration also leads to a better sensitivity to theoctant.