在$ν$ 2 HDM模型中用$ν\rightarrow 3 ν$中微子分裂解释IceCube谱
Explanation of IceCube spectrum with $ν\rightarrow 3 ν$ neutrino splitting in a $ν$2HDM model
摘要：
高能中微子的单一幂律通量谱不能充分解释在冰立方观测到的整个60 TeV至10 PeV事件谱，特别是在6.3 PeV处预期的过量PeV事件和缺乏P-how共振事件不能同时用单一幂律源中微子通量来解释。在这里，我们考虑一个模型的中微子分裂$ν\rightarrow 3 ν$在宇宙学的距离。从一个单一的幂律谱预期从天体物理源，我们表明，通过调整衰减长度和光谱指数，可以得到一个更好的拟合观测到的冰立方事件在整个1 TeV-6 PeV，相比，从一个单一的功率谱。对于$ν\rightarrow 3ν$中微子分裂，子中微子的味道比不同于标准振荡或不可见衰变的情况，可以用作这种情况的测试。我们提出了一个$ν$ 2 HDM，其中轻Higgs（$\sim 0.1$ ~eV）介导的中微子分裂通过一个单圈盒图。分裂的标量的质量在双重的斜T参数，这是严重的限制了一个很大的贡献。通过引入质量为$\sim 200$ GeV的额外矢量轻子二重态，可以避开S，T，U斜参数的限制。
英文摘要：
A single power law flux spectrum of high energy neutrinos does not adequately explain the entire 60 TeV to 10 PeV event spectrum observed at IceCube, specially the excess of PeV events and the lack of Glashow resonance events expected at 6.3 PeV cannot be simultaneously explained by a single power law source neutrino flux. Here we consider a model of neutrino splitting $ν\rightarrow 3 ν$ over cosmological distances. Starting from a single power-law spectrum expected from the astrophysical sources, we show that by adjusting the decay length and spectral index one can give a better fit to the observed IceCube events over the entire 1 TeV -6 PeV, compared to that from a single power spectrum. For $ν\rightarrow 3ν$ neutrino splitting, the flavor ratios of the daughter neutrinos are different from the standard oscillation or invisible decay cases and can be used as a test of this scenario. We propose a $ν$2HDM where a light Higgs ($\sim 0.1$~eV) mediates neutrino splitting via a one-loop box diagram. The split in the masses of the scalars in the doublet gives a large contribution to the oblique T parameter which is severely constrained. This constraint from the S,T,U oblique parameters can be evaded by the introduction of an extra vector lepton doublet and with mass $\sim 200$ GeV.
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