@misc{10481/106056,
year = {2025},
month = {3},
url = {https://hdl.handle.net/10481/106056},
abstract = {A 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 upward-going 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.},
organization = {Ministerio de Ciencia, Innovación y Universidades / Agencia Estatal de Investigación (María de Maeztu Grant No. CEX2023-001318-M, PID2022-140510NB-I00, PCI2023-145952-2, RYC2019-027017-I)},
organization = {Xunta de Galicia (CIGUS Network of Research Centers, Consolidación 2021 GRC GI-2033, ED431C-2021/ 22, and 2022 ED431F-2022/15)},
organization = {Junta de Andalucía (SOMM17/6104/UGR and P18-FR-4314)},
organization = {European Union (Marie Skłodowska-Curie 101065027 and ERDF)},
publisher = {American Physical Society},
title = {Search for the Anomalous Events Detected by ANITA Using the Pierre Auger Observatory},
doi = {10.1103/PhysRevLett.134.121003},
author = {Abdul Halim, A. and Pierre Auger Collaboration, / and Bueno Villar, Antonio},
}