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arXiv 2202.07080astro-ph.HEastro-ph.IM
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用Askaryan射电阵列进行低阈值超高能中微子搜索

A low-threshold ultrahigh-energy neutrino search with the Askaryan Radio Array

P. Allison, S. Archambault, J. J. Beatty, D. Z. Besson, A. Bishop, C. C. Chen, C. H. Chen, P. Chen, Y. C. Chen, B. A. Clark, W. Clay, A. Connolly, L. Cremonesi,… 展开作者

P. Allison, S. Archambault, J. J. Beatty, D. Z. Besson, A. Bishop, C. C. Chen, C. H. Chen, P. Chen, Y. C. Chen, B. A. Clark, W. Clay, A. Connolly, L. Cremonesi, P. Dasgupta, J. Davies, S. de Kockere, K. D. de Vries, C. Deaconu, M. A. DuVernois, J. Flaherty, E. Friedman, R. Gaior, J. Hanson, N. Harty, B. Hendricks, K. D. Hoffman, E. Hong, S. Y. Hsu, L. Hu, J. J. Huang, M. -H. Huang, K. Hughes, A. Ishihara, A. Karle, J. L. Kelley, K. -C. Kim, M. -C. Kim, I. Kravchenko, R. Krebs, Y. Ku, C. Y. Kuo, K. Kurusu, H. Landsman, U. A. Latif, C. -J. Li, T. -C. Liu, M. -Y. Lu, B. Madison, K. Madison, K. Mase, T. Meures, J. Nam, R. J. Nichol, G. Nir, A. Novikov, A. Nozdrina, E. Oberla, J. Osborn, Y. Pan, C. Pfendner, N. Punsuebsay, J. Roth, D. Seckel, M. F. H. Seikh, Y. -S. Shiao, A. Shultz, D. Smith, S. Toscano, J. Torres, J. Touart, N. van Eijndhoven, G. S. Varner, A. Vieregg, M. -Z. Wang, S. -H. Wang, Y. H. Wang, S. A. Wissel, C. Xie, S. Yoshida, R. Young

摘要:

在追求测量仍然难以捉摸的超高能(UHE)中微子通量的能量为EeV的顺序,探测器使用在冰Askaryan无线电技术越来越多地针对较低的触发阈值。这导致了对UHE中微子的更高的灵敏度。利用Askaryan射电阵列(ARA)收集的数据,我们在迄今为止达到的最低阈值下搜索中微子候选者,从而提高了分析水平的灵敏度。对来自降低阈值的第五ARA站的208.7天的数据集进行了中微子搜索,在模拟的混合组分中微子通量上获得了68%的分析效率,预期的背景是通过分析的$0.10_{-0.04}^{+0.06}$事件。我们观察到一个事件通过我们的分析,并着手设置中微子通量限制使用Feldman-Brachins建设。我们表明,通过分析,可以进行改进的天线水平的灵敏度,激励相控阵触发技术用于未来的无线电探测实验。我们还包括一个投影使用所有可用的数据从这个探测器。最后,我们发现,未来的分析将受益于研究的事件附近的表面,以充分了解预期的大规模探测器的背景。

英文摘要:

In the pursuit of the measurement of the still-elusive ultrahigh-energy (UHE) neutrino flux at energies of order EeV, detectors using the in-ice Askaryan radio technique have increasingly targeted lower trigger thresholds. This has led to improved trigger-level sensitivity to UHE neutrinos. Working with data collected by the Askaryan Radio Array (ARA), we search for neutrino candidates at the lowest threshold achieved to date, leading to improved analysis-level sensitivities. A neutrino search on a data set with 208.7~days of livetime from the reduced-threshold fifth ARA station is performed, achieving a 68\% analysis efficiency over all energies on a simulated mixed-composition neutrino flux with an expected background of $0.10_{-0.04}^{+0.06}$ events passing the analysis. We observe one event passing our analysis and proceed to set a neutrino flux limit using a Feldman-Cousins construction. We show that the improved trigger-level sensitivity can be carried through an analysis, motivating the Phased Array triggering technique for use in future radio-detection experiments. We also include a projection using all available data from this detector. Finally, we find that future analyses will benefit from studies of events near the surface to fully understand the background expected for a large-scale detector.

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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