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Constraints on the Diffuse Flux of Ultra-High Energy Neutrinos from Four Years of Askaryan Radio Array Data in Two Stations

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arxiv 1912.00987 v2 pith:NJIEZXFO submitted 2019-12-02 astro-ph.HE astro-ph.IM

ARA Collaboration: P. Allison , S. Archambault , J.J. Beatty , M. Beheler-Amass , D.Z. Besson , M. Beydler , C.C. Chen , C.H. Chen
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P. Chen B.A. Clark W. Clay A. Connolly L. Cremonesi J. Davies S. de Kockere K.D. de Vries C. Deaconu M. Duvernois E. Friedman R. Gaior J. Hanson K. Hanson K.D. Hoffman B. Hokanson-Fasig E. Hong S.Y. Hsu L. Hu J.J. Huang M.-H. Huang K. Hughes A. Ishihara A. Karle J.L. Kelley R. Khandelwal K.-C. Kim M.-C. Kim I. Kravchenko K. Kurusu H. Landsman U.A. Latif A. Laundrie C.-J. Li T.-C. Liu M.-Y. Lu B. Madison K. Mase T. Meures J. Nam R.J. Nichol G. Nir A. Novikov A. Nozdrina E. Oberla A. O'Murchadha J. Osborn Y. Pan C. Pfendner J. Roth P. Sandstrom D. Seckel Y.-S. Shiao A. Shultz D. Smith J. Torres J. Touart N. van Eijndhoven G.S. Varner A.G. Vieregg M.-Z. Wang S.-H. Wang S.A. Wissel S. Yoshida R. Young
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classification astro-ph.HEastro-ph.IM
keywords neutrinosdiffuseenergyfluxfourradiotextrmultra-high
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abstract

The Askaryan Radio Array (ARA) is an ultra-high 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 ultra-high energy neutrinos between $10^{16}-10^{21}$ 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 $10^{18}$ eV of $EF(E)=5.6\times10^{-16}$ $\textrm{cm}^{-2}$$\textrm{s}^{-1}$$\textrm{sr}^{-1}$. This analysis includes four times the exposure of the previous ARA result, and represents approximately 1/5 the exposure expected from operating ARA until the end of 2022.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

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

    astro-ph.HE 2026-02 unverdicted novelty 6.0 of 10

    A new analytic Askaryan model including ice propagation and RF response matches Monte Carlo simulations with correlations above 0.94 and rejects thermal noise at very low rates.

  2. Complex Analysis of Askaryan Radiation: UHECR Reconstruction

    astro-ph.HE 2026-06 unverdicted novelty 5.0 of 10

    An analytical Askaryan-plus-channel model matches 13 ARA UHECR candidate waveforms with correlations 0.69–0.86 and recovers an E-field consistent with prior ARA results.

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

    astro-ph.HE 2026-05 unverdicted novelty 4.0 of 10

    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...

  4. Complex Analysis of Askaryan Radiation: UHECR Reconstruction

    astro-ph.HE 2026-06 unverdicted novelty 3.0 of 10

    An analytical model of Askaryan radiation plus detector response is shown to match 13 ARA UHECR candidate waveforms with correlations 0.69-0.86.

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