Search for the Anomalous Events Detected by ANITA Using the Pierre Auger Observatory

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dc.contributor.authorAbdul Halim, A.
dc.contributor.authorAbreu, P.
dc.contributor.authorAglietta, M.
dc.contributor.authorAllekotte, I.
dc.contributor.authorAlmeida Cheminant, K.
dc.contributor.authorAlmela, A.
dc.contributor.authorAloisio, R.
dc.contributor.authorAlvarez-Muñiz, J.
dc.contributor.authorAmmerman Yebra, J.
dc.contributor.authorAnastasi, G.A.
dc.contributor.authorAnchordoqui, L.
dc.contributor.authorAndrada, B.
dc.contributor.authorAndringa, S.
dc.contributor.authorApollonio, L.
dc.contributor.authorAramo, C.
dc.contributor.authorAraújo Ferreira, P.R.
dc.contributor.authorArnone, E.
dc.contributor.authorArteaga Velázquez, J.C.
dc.contributor.authorAssis, P.
dc.contributor.authorAvila, G.
dc.contributor.authoret al.
dc.date.issued2025
dc.description.abstractA dedicated search for upward-going air showers at zenith angles exceeding 110° and energies E > 0.1 EeV has been performed using the Fluorescence Detector of the Pierre Auger Observatory. The search is motivated by two “anomalous” radio pulses observed by the ANITA flights I and III that appear inconsistent with the standard model of particle physics. Using simulations of both regular cosmic-ray showers and upward-going events, a selection procedure has been defined to separate potential upwardgoing candidate events and the corresponding exposure has been calculated in the energy range [0.1–33] EeV. One event has been found in the search period between January 1, 2004, and December 31, 2018, consistent with an expected background of 0.27 ± 0.12 events from misreconstructed cosmic-ray showers. This translates to an upper bound on the integral flux of (7.2 ± 0.2) × 10⁻²¹ cm⁻² sr⁻¹ y⁻¹ and (3.6 ± 0.2) × 10⁻²⁰ cm⁻² sr⁻¹ y⁻¹ for an E⁻¹ and E⁻² spectrum, respectively. An upward-going flux of showers normalized to the ANITA observations is shown to predict over 34 events for an E⁻³ spectrum and over 8.1 events for a conservative E⁻⁵ spectrum, in strong disagreement with the interpretation of the anomalous events as upward-going showers.
dc.description.statementofresponsibilityPierre Auger Collaboration
dc.identifier.citationPhysical Review Letters, 2025; 134(12):121003-1-121003-10
dc.identifier.doi10.1103/PhysRevLett.134.121003
dc.identifier.issn0031-9007
dc.identifier.issn1079-7114
dc.identifier.orcidClay, R.W. [0000-0002-9040-9648]
dc.identifier.orcidDawson, B.R. [0000-0002-4271-3055]
dc.identifier.urihttps://hdl.handle.net/2440/147788
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.grantARC
dc.rightsPublished by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
dc.source.urihttps://doi.org/10.1103/physrevlett.134.121003
dc.subjectCosmic ray composition & spectra; Extrasolar neutrino astronomy; Particle dark matter; Cosmic rays & astroparticles; Neutrino detection
dc.titleSearch for the Anomalous Events Detected by ANITA Using the Pierre Auger Observatory
dc.typeJournal article
pubs.publication-statusPublished

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