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arXiv 1207.4571astro-ph.HEhep-exhep-ph
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电子-反中微子共振引发的IceCube PeV级联事件

IceCube PeV Cascade Events Initiated by Electron-Antineutrinos at Glashow Resonance

V. Barger, J. Learned, S. Pakvasa

摘要:

我们提出了一个解释的两个中微子引发的级联事件与PeV能量观察冰立方:超高能宇宙射线质子(或铁核)散射CMB光子通过德尔塔共振(Berezinsky-Zatsepin过程)产生带电π介子和中子。中子衰变产生电子-反中微子,它们经历中微子振荡以填充所有的反中微子味,但电子-反中微子通量仍然占主导地位。在6.3 PeV的电子-反中微子能量下,它们在IceCube探测器中对电子的湮灭会被W-boson共振增强,W-boson共振的衰变可以在IceCube探测器中观察到PeV簇射。两个观测到的具有~1 PeV能量的簇射需要从W轻子衰变到电子和τ。一个数量级更高的事件率的阵雨在6.3 PeV的预测从W强子衰变。这种解释可以在短期内得到检验。它对最高能量宇宙射线的起源具有重要的物理意义,因为中微子事件和宇宙射线事件可能具有共同的起源。

英文摘要:

We propose an interpretation of the two neutrino initiated cascade events with PeV energies observed by IceCube: Ultra-high energy cosmic ray protons (or Fe nuclei) scatter on CMB photons through the Delta-resonance (the Berezinsky-Zatsepin process) yielding charged pions and neutrons. The neutron decays give electron-antineutrinos which undergo neutrino oscillations to populate all antineutrino flavors, but the electron-antineutrino flux remains dominant. At 6.3 PeV electron-antineutrino energy their annihilation on electrons in the IceCube detector is enhanced by the Glashow resonance (the W-boson) whose decays can give the PeV showers observed in the IceCube detector. The two observed showers with ~1 PeV energies would need to be from W leptonic decays to electrons and taus. An order of magnitude higher event rate of showers at 6.3 PeV is predicted from W to hadron decays. This interpretation can be tested in the near term. It has significant physics implications on the origin of the highest energy cosmic rays, since neutrino events and cosmic ray events likely share a common origin.

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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