Imprints of CP violation induced by sterile neutrinos in T2K data
Imprints of CP violation induced by sterile neutrinos in T2K data
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DOI：
10.1103/physrevd.91.073017
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发表时间：
2014-12
影响因子：
5
通讯作者：
N. Klop;A. Palazzo
中科院分区：
文献类型：
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作者：
N. Klop;A. Palazzo
我们调查的影响轻（$\sim$ eV）无菌中微子在长基线实验T2 K。我们发现，在3+1方案中，对于短基线异常所暗示的质量混合参数，无菌和大气振荡频率之间的干扰在$\nu\mu \to \nu_e$跃迁概率中引入了一个新的项，该项与标准的3味太阳-大气干扰项具有相同的数量级。我们首次表明，当前的T2 K数据与$\theta_{13}$专用反应堆实验的结果一起，对3+1方案中涉及的三个CP违反阶段中的两个敏感。标准CP相位和新CP相位（在我们的参数化选择中为$\delta_{13} \equiv \delta$和$\delta_{14}$）都倾向于具有共同的最佳拟合值$\delta_{13} \simeq \delta_{14} \simeq -\pi/2$。非常有趣的是，包括无菌中微子效应导致更好的协议之间的两个估计$\theta_{13}$，分别从反应堆和T2 K，这在3味框架略有不同。
We investigate the impact of light ($\sim$ eV) sterile neutrinos in the long-baseline experiment T2K. We show that, within the 3+1 scheme, for mass-mixing parameters suggested by the short-baseline anomalies, the interference among the sterile and the atmospheric oscillation frequencies induces a new term in the $\nu_\mu \to \nu_e$ transition probability, which has the same order of magnitude of the standard 3-flavor solar-atmospheric interference term. We show, for the first time, that current T2K data, taken together with the results of the $\theta_{13}$-dedicated reactor experiments, are sensitive to two of the three CP-violating phases involved in the 3+1 scheme. Both the standard CP-phase and the new one ($\delta_{13} \equiv \delta$ and $\delta_{14}$ in our parameterization choice) tend to have a common best fit value $\delta_{13} \simeq \delta_{14} \simeq -\pi/2$. Quite intriguingly, the inclusion of sterile neutrino effects leads to better agreement between the two estimates of $\theta_{13}$ obtained, respectively, from reactors and T2K, which in the 3-flavor framework are slightly different.