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arXiv 1201.3047hep-phhep-ex
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中微子振荡中的非标准相互作用和最近的大亚湾、T2K实验

Non-standard interaction in neutrino oscillations and recent Daya Bay, T2K experiments

Rathin Adhikari, Sabyasachi Chakraborty, Arnab Dasgupta, Sourov Roy

摘要:

利用T2 K和大亚湾中微子振荡实验的最新结果,我们以一种与模型无关的方式研究了非标准相互作用的可能约束。本文用微扰法给出了$ν_μ\rightarrow ν_e$振荡几率的一般公式(适用于T2 K基线和大亚湾的大规模$θ_{13}$),其中考虑了中微子在源($ε^s$)、探测器($ε^d$)和传播过程($ε^m$)的NSI。两个单独的情况下的扰动与小(略大)NSI($ε_{αβ}^m \sim 0.03(0.18)$)进行了详细讨论。使用各种可能的目前允许的NSI值,我们重新分析数值的$θ_{13} - δ$允许的区域,最近的T2 K的实验数据。我们使用大亚湾测得的$θ_{13}$值,在$δ-ε_{αβ}^m$平面上获得对NSI的模型无关约束,其中$δ$是CP破坏相位。根据$δ$的值,对$ε_{eτ}$和$ε_{ττ}$的重要约束,特别是对中微子质量的两个层次都是可能的。对应于T2 K的66%置信水平结果,对$ε_{ττ}$的约束显示为与任何$δ$值无关。

英文摘要:

We study the possible constraints on non-standard interaction(NSIs) in a model independent way by considering the recent results from T2K and Daya Bay neutrino oscillations experiments. Using perturbation method we present generic formulas (suitable for T2K baseline and for large $θ_{13}$ as evident from Daya Bay) for the probability of oscillation for $ν_μ\rightarrow ν_e$, taking into account NSIs at source ($ε^s$), detector ($ε^d$) and during propagation ($ε^m$) of neutrinos through matter. Two separate cases of perturbation with small (slightly large) NSI ($ε_{αβ}^m \sim 0.03(0.18)$) are discussed in detail. Using various possible presently allowed NSI values we reanalyze numerically the $θ_{13} - δ$ allowed region given by recent T2K experimental data. We obtain model independent constraints on NSIs in the $δ-ε_{αβ}^m$ plane using the $θ_{13}$ value as measured by Daya Bay, where $δ$ is the CP violating phase. Depending on $δ$ values significant constraints on $ε_{eτ}$ and $ε_{ττ}$, in particular, are possible for both hierarchies of neutrino masses. Corresponding to T2K's 66% confidence level result, the constraints on $ε_{ττ}$ is shown to be independent of any $δ$ value.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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