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arXiv 0903.4654hep-phastro-ph.HE
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SHALON重中微子衰变

Heavy neutrino decay at SHALON

V. G. Sinitsyna, M. Masip, S. I. Nikolsky, V. Y. Sinitsyna

摘要:

在过去的17年里,SHALON Cherenkov望远镜已经记录了超过2x10^6的大范围空气簇射。对不同天顶角(θ)处信号的分析包括来自近水平方向θ= 97 ^o的观测。这个倾角定义了一个掠过地球的轨道,在望远镜前面有7公里的空气和大约1000公里的岩石。在324小时的观测期间,经过一系列可能由混乱的天空闪光或垂直阵雨的雪反射引起的类似闪电的事件后,我们探测到了5个TeV能量的空气阵雨。我们认为,这些事件可能是由一个长寿命的穿透粒子从地面进入大气层,并在望远镜前衰变引起的。我们证明了这种粒子不可能是μ介子或τ轻子。作为一种可能的解释,我们讨论了质量为m \approx 0.5 GeV和cτ \approx 30 m的不稳定中微子的两种情况。值得注意的是,最近有人提出了其中一个模型来解释MiniBooNE中过量的类电子中微子事件。

英文摘要:

The SHALON Cherenkov telescope has recorded over 2x10^6 extensive air showers during the past 17 years. The analysis of the signal at different zenith angles (θ) has included observations from the sub-horizontal direction θ=97^o. This inclination defines an Earth skimming trajectory with 7 km of air and around 1000 km of rock in front of the telescope. During a period of 324 hours of observation, after a cut of shower-like events that may be caused by chaotic sky flashes or reflections on the snow of vertical showers, we have detected 5 air showers of TeV energies. We argue that these events may be caused by the decay of a long-lived penetrating particle entering the atmosphere from the ground and decaying in front of the telescope. We show that this particle can not be a muon or a tau lepton. As a possible explanation, we discuss two scenarios with an unstable neutrino of mass m\approx 0.5 GeV and cτ\approx 30 m. Remarkably, one of these models has been recently proposed to explain an excess of electron-like neutrino events at MiniBooNE.

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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