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arXiv 1301.4577hep-ph
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用μ子计数探测中微子质谱

Counting muons to probe the neutrino mass spectrum

Carolina Lujan-Peschard, Giulia Pagliaroli, Francesco Vissani

摘要:

θ_{13}大的实验证据为确定中微子质谱提供了新的机会。我们概述了一种可能性,调查这个问题,通过常规技术。理想的设置是长基线实验:μ子中微子束,靶上有10^{20}个质子,平均能量为6(8)GeV;中微子在传播6000(8000)km后,由1 Mton的μ子探测器观察到,μ子能量阈值为2 GeV。预期的μ子事件数约为1000,两个中微子光谱之间的差异相当大,约为30%。这允许仅计数μ子轨道的质谱的识别。信号事件的实验特征在于他们的时间和方向的到来,和2/3的人是在一个区域,几乎没有大气中微子背景,即4 GeV和10 GeV之间。从欧洲核子研究中心到贝加尔湖,从费米实验室到KM 3 NET或ANTARES的距离都在理想范围内。

英文摘要:

The experimental evidence that θ_{13} is large opens new opportunities to identify the neutrino mass spectrum. We outline a possibility to investigate this issue by means of conventional technology. The ideal setup turns out to be long baseline experiment: the muon neutrino beam, with 10^{20} protons on target, has an average energy of 6 (8) GeV; the neutrinos, after propagating 6000 (8000) km, are observed by a muon detector of 1 Mton and with a muon energy threshold of 2 GeV. The expected number of muon events is about 1000, and the difference between the two neutrino spectra is sizeable, about 30%. This allows the identification of the mass spectrum just counting muon tracks. The signal events are well characterized experimentally by their time and direction of arrival, and 2/3 of them are in a region with little atmospheric neutrino background, namely, between 4 GeV and 10 GeV. The distances from CERN to Baikal Lake and from Fermilab to KM3NET, or ANTARES, fit in the ideal range.

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