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arXiv 1407.3591astro-ph.HEhep-exhep-ph
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地球大气中高能中微子通量和味比

High-energy neutrino fluxes and flavor ratio in the Earth's atmosphere

T. S. Sinegovskaya, A. D. Morozova, S. I. Sinegovsky

摘要:

本文利用几种已知的强子模型和几种考虑膝点的宇宙线谱参数化方法,计算了能量范围为$100$ GeV - $10$ PeV的大气中微子通量。计算结果与Frejus、AMANDA、IceCube和ANTARES的大气中微子测量结果进行了比较。本文给出了常规的($ν_μ+\barν_μ$)和($ν_e+\barν_e$)能谱在天顶角上的平均值的解析描述,它可用于中微子望远镜中中微子事例重建的测试数据。计算的大气$ν_μ$通量与IceCube最佳拟合天体物理通量之和明显高于IceCube 59的数据,这就对高能天体物理中微子通量的等味成分假说提出了质疑。计算表明,如果考虑瞬发中微子分量,从大气电子中微子通量到天体物理中微子优势的跃迁发生在$30-100$ TeV。从IceCube数据中提取的中微子味比并没有显示出在$100$ GeV - $30$ TeV能量范围内的传统中微子通量所预期的随能量增加而增加的趋势。比值$R_{ν_μ/ν_e}$的降低可能表明,在冰立方实验中获得的大气电子中微子通量包含$10-50$ TeV范围内的天体物理中微子的混合物。

英文摘要:

We calculate the atmospheric neutrino fluxes in the energy range $100$ GeV -- $10$ PeV with the use of several known hadronic models and a few parametrizations of the cosmic ray spectra which take into account the knee. The calculations are compared with the atmospheric neutrino measurements by Frejus, AMANDA, IceCube and ANTARES. An analytic description is presented for the conventional ($ν_μ+\barν_μ$) and ($ν_e+\barν_e$) energy spectra, averaged over zenith angles, which can be used to obtain test data of the neutrino event reconstruction in neutrino telescopes. The sum of the calculated atmospheric $ν_μ$ flux and the IceCube best-fit astrophysical flux gives the evidently higher flux as compared to the IceCube59 data, giving rise the question concerning the hypothesis of the equal flavor composition of the high-energy astrophysical neutrino flux. Calculations show that the transition from the atmospheric electron neutrino flux to the predominance of the astrophysical neutrinos occurs at $30-100$ TeV if the prompt neutrino component is taken into consideration. The neutrino flavor ratio, extracted from the IceCube data, does not reveal the trend to increase with the energy as is expected for the conventional neutrino flux in the energy range $100$ GeV - $30$ TeV. A depression of the ratio $R_{ν_μ/ν_e}$ possibly indicates that the atmospheric electron neutrino flux obtained in the IceCube experiment contains an admixture of the astrophysical neutrinos in the range $10-50$ TeV.

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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