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Triboelectric backgrounds to radio-based polar ultra-high energy neutrino (UHEN) experiments

https://doi.org/10.1016/j.astropartphys.2022.102790

Aguilar, J.A.; Anker, A.; Allison, P.; Archambault, S.; Baldi, P.; Barwick, S.W.; Beatty, J.J.; Beise, J.; Besson, D.; Bishop, A.; et al (March 2023, Astroparticle Physics)

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Low-threshold ultrahigh-energy neutrino search with the Askaryan Radio Array

https://doi.org/10.1103/PhysRevD.105.122006

Allison, P.; Archambault, S.; Beatty, J. J.; Besson, D. Z.; Bishop, A.; Chen, C. C.; Chen, C. H.; Chen, P.; Chen, Y. C.; Clark, B. A.; et al (June 2022, Physical Review D)

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Constraints on the diffuse flux of ultrahigh energy neutrinos from four years of Askaryan Radio Array data in two stations

https://doi.org/10.1103/PhysRevD.102.043021

Allison, P.; Archambault, S.; Beatty, J. J.; Chen, C. C.; Chen, C. H.; Chen, P.; Clark, B. A.; Connolly, A.; Cremonesi, L.; Davies, J.; et al (August 2020, Physical review)

The Askaryan Radio Array (ARA) is an ultrahigh energy (UHE, >10^17 eV) neutrino detector designed to observe neutrinos by searching for the radio waves emitted by the relativistic products of neutrino-nucleon interactions in Antarctic ice. In this paper, we present constraints on the diffuse flux of ultrahigh energy neutrinos between 1016 and 1021 eV resulting from a search for neutrinos in two complementary analyses, both analyzing four years of data (2013–2016) from the two deep stations (A2, A3) operating at that time. We place a 90% CL upper limit on the diffuse all flavor neutrino flux at 1018 eV of EF(E)=5.6×10^−16 cm^−2 s^−1 sr^−1. This analysis includes four times the exposure of the previous ARA result and represents approximately 1/5^th the exposure expected from operating ARA until the end of 2022.
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