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arXiv 1105.0302hep-phastro-ph.COastro-ph.HE
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第四代重Majorana中微子的Cosmic Ray电子和正电子超数

Cosmic Ray Electron and Positron Excesses from a Fourth Generation Heavy Majorana Neutrino

Isabella Masina, Francesco Sannino

摘要:

最近,PAMELA和Fermi-LAT卫星实验观测到了宇宙射线电子和正电子能谱中意想不到的特征,这为间接显示新物理学开辟了令人兴奋的可能性。TeV尺度的第四轻子族是标准模型轻子扇区的自然延伸(也与最小步行模型中的层次问题有关)。这个装置中的重马约拉纳中微子通过弱带电电流相互作用与标准模型带电轻子混合。在这里,我们首先解析地研究了起源于重Majorana中微子衰变模的电子和正电子的能谱,也包括极化效应。然后,我们比较了这个模型的预测与实验数据,利用标准的直接方法和我们最近提出的求和规则方法。我们发现,衰变模式涉及的τ和/或μ子带电轻子作为初级衰变产物适合PAMELA和费米-LAT轻子过剩,而有相对于PAMELA约束的反质子分数的紧张局势。

英文摘要:

Unexpected features in the energy spectra of cosmic rays electrons and positrons have been recently observed by PAMELA and Fermi-LAT satellite experiments, opening to the exciting possibility of an indirect manifestation of new physics. A TeV-scale fourth lepton family is a natural extension of the Standard Model leptonic sector (also linked to the hierarchy problem in Minimal Walking Technicolor models). The heavy Majorana neutrino of this setup mixes with Standard Model charged leptons through a weak charged current interaction. Here, we first study analytically the energy spectrum of the electrons and positrons originated in the heavy Majorana neutrino decay modes, also including polarization effects. We then compare the prediction of this model with the experimental data, exploiting both the standard direct method and our recently proposed Sum Rules method. We find that the decay modes involving the tau and/or the muon charged leptons as primary decay products fit well the PAMELA and Fermi-LAT lepton excesses while there is tension with respect to the antiproton to proton fraction constrained by PAMELA.

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