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arxiv: 2202.07080 · v1 · pith:ZV34SCJCnew · submitted 2022-02-14 · 🌌 astro-ph.HE · astro-ph.IM

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
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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
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classification 🌌 astro-ph.HE astro-ph.IM
keywords neutrinoanalysisarrayaskaryandatafluximprovedradio
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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.

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Cited by 3 Pith papers

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  1. Complex Analysis of Askaryan Radiation: UHE-$\nu$ Identification and Reconstruction using the Hilbert Envelope of Observed Signals

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  2. Sensitivity of the As-Built Askaryan Radio Array to Ultra-High Energy Neutrinos

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    With 2013-2023 exposure, the as-built ARA achieves world-leading UHE neutrino sensitivity above ~10^19 eV and predicts up to 13 trigger-level events under optimistic flux models, with secondaries contributing up to 30...

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