Allison, P;
Archambault, S;
Beatty, JJ;
Besson, DZ;
Bishop, A;
Chen, CC;
Chen, CH;
... Young, R; + view all
(2022)
Low-threshold ultrahigh-energy neutrino search with the Askaryan Radio Array.
Physical Review D
, 105
(12)
, Article 122006. 10.1103/PhysRevD.105.122006.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Low-threshold ultrahigh-energy neutrino search with the Askaryan Radio Array |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevD.105.122006 |
| Publisher version: | https://doi.org/10.1103/PhysRevD.105.122006 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10153074 |
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