ANITA第四次飞行对超高能宇宙中微子通量的约束
Constraints on the ultra-high energy cosmic neutrino flux from the fourth flight of ANITA
摘要：
美国宇航局长时间气球有效载荷ANITA（ANITA）在28天的飞行时间后于2016年12月完成了第四次飞行。ANITA对极冰中超高能中微子相互作用产生的脉冲宽带无线电发射（Askaryan发射）敏感。我们提出了两个独立的盲分析的结果，从ANITA的第四次飞行的数据中搜索来自Askaryan发射的信号。更灵敏的分析具有更好的预期限度，背景估计值为$0.64^{+0.69}_{-0.45}$，分析效率为$82\pm2\%$。第二次分析的背景估计值为$0.34^{+0.66}_{-0.16}$，分析效率为$71\pm6\%$。每次分析在信号区域发现一个事件，与每次分析的背景估计一致。由此产生的极限进一步收紧了对能量高于$10^{19.5}$ eV的超高能中微子扩散通量的约束。
英文摘要：
The ANtarctic Impulsive Transient Antenna (ANITA) NASA long-duration balloon payload completed its fourth flight in December 2016, after 28 days of flight time. ANITA is sensitive to impulsive broadband radio emission from interactions of ultra-high-energy neutrinos in polar ice (Askaryan emission). We present the results of two separate blind analyses searching for signals from Askaryan emission in the data from the fourth flight of ANITA. The more sensitive analysis, with a better expected limit, has a background estimate of $0.64^{+0.69}_{-0.45}$ and an analysis efficiency of $82\pm2\%$. The second analysis has a background estimate of $0.34^{+0.66}_{-0.16}$ and an analysis efficiency of $71\pm6\%$. Each analysis found one event in the signal region, consistent with the background estimate for each analysis. The resulting limit further tightens the constraints on the diffuse flux of ultra-high-energy neutrinos at energies above $10^{19.5}$ eV.
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