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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1508.01698hep-ph
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超高能宇宙中微子的中微子性质

Neutrino properties from ultra-high energy cosmic neutrinos

Yanqi Huang, Bo-Qiang Ma

摘要:

超高能宇宙中微子(UHECN)的探测可以限制中微子的性质。利用更新的中微子混合参数的全局拟合结果,我们从三个可能的天体物理来源预测了地球上的中微子味比。通过与最新的IceCube实验数据的比较,我们发现在初始比例为$ϕ_{ν_e}^0:ϕ_{ν_μ}^0:ϕ_{ν_τ}^0=$ 1:2:0和0:1:0的情况下,正态层次(NH)和逆层次(IH)的结果与标准中微子振荡的结果是一致的.我们还研究了在标准模型之外的中微子衰变情形中的中微子味比,并介绍了中微子的两个质量本征态,$ν_1$和$ν_2$是退化的。我们发现在$3σ$误差范围内,IceCube数据中1:2:0和0:1:0源的IH和退化NH情况仍然是允许的。讨论了仅依赖中微子混合和振荡框架的一般约束。

英文摘要:

Neutrino properties can be constrained by the detection of ultra-high energy cosmic neutrinos (UHECNs). By using the updated global fitting results of neutrino mixing parameters, we present predictions on the neutrino flavor ratios at the Earth from three possibly astrophysical sources. Comparing with the latest IceCube data, we find that the normal hierarchy (NH) and inverted hierarchy (IH) cases from the initial ratios $ϕ_{ν_e}^0:ϕ_{ν_μ}^0:ϕ_{ν_τ}^0=$1:2:0 and 0:1:0 are compatible with the data in the standard neutrino oscillation scenario. We also examine the neutrino flavor ratios in a neutrino decay scenario beyond the standard model, and introduce the special case that two mass eigenstates of neutrinos, i.e., $ν_1$ and $ν_2$, are degenerated. We find that the IH case and the degenerate NH case from the 1:2:0 and 0:1:0 sources are still permissible with the IceCube data within the $3σ$ error range. The general constraints only rely on the neutrino mixing and oscillation framework are also discussed.

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