Journal article
Probing the PeV region in the astrophysical neutrino spectrum using ν μ from the Southern sky
Physical review. D, Vol.112(1), 012022
07/2025
DOI: 10.1103/2hnq-1fsx
Abstract
IceCube has observed a diffuse astrophysical neutrino flux over the energy region from a few TeV to a few PeV. At PeV energies, the spectral shape is not yet well measured due to the low statistics of the data. This analysis probes the gap between 1 and 10 PeV by using high-energy downgoing muon neutrinos. To reject the large atmospheric muon background, two complementary techniques are combined. The first technique selects events with high stochasticity to reject atmospheric muon bundles whose stochastic energy losses are smoothed due to high muon multiplicity. The second technique vetoes atmospheric muons with the IceTop surface array. Using 9 yrs of data, we found two neutrino candidate events in the signal region, consistent with expectation from background, each with relatively high signal probabilities. A joint maximum likelihood estimation is performed using this sample and an independent 9.5-yr sample of tracks to measure the neutrino spectrum. A likelihood ratio test is done to compare the single power-law (SPL) vs SPL+cutoff hypothesis; the SPL+cutoff model is not significantly better than the SPL. High-energy astrophysical objects from four source catalogs are also checked around the direction of the two events. No significant coincidence was found.
Details
- Title: Subtitle
- Probing the PeV region in the astrophysical neutrino spectrum using ν μ from the Southern sky
- Creators
- R. Abbasi - Loyola University ChicagoM. Ackermann - Deutsches Elektronen-Synchrotron DESYJ. Adams - University of CanterburyS. K. Agarwalla - University of Wisconsin–MadisonM. Ahlers - University of CopenhagenJ M Alameddine - TU Dortmund UniversityN. M. Amin - University of DelawareK. Andeen - Marquette UniversityMatheus Hostert (Contributor) - University of Iowa, Physics and AstronomyIceCube Collaboration
- Resource Type
- Journal article
- Publication Details
- Physical review. D, Vol.112(1), 012022
- DOI
- 10.1103/2hnq-1fsx
- ISSN
- 2470-0010
- eISSN
- 2470-0029
- Publisher
- AMER PHYSICAL SOC; COLLEGE PK
- Grant note
- U.S. National Science Foundation-Office of Polar Programs, U.S. National Science Foundation-Physics Division, U.S. National Science Foundation-EPSCoR, U.S. National Science Foundation-Office of Advanced Cyberinfrastructure, Wisconsin Alumni Research FoundaCenter for High Throughput Computing (CHTC) at the University of Wisconsin-MadisonAdvanced Cyberinfrastructure Coordination Ecosystem: Services & Support (ACCESS)NVIDIA CorporationGoogle Cloud Platform (USA)BFundsFWO Odysseus and Big Science programsBelgian Federal Science Policy Office (Belspo) (Belgium)Bundesministerium fur Bildung und Forschung (BMBF)Deutsche Forschungsgemeinschaft (DFG)Helmholtz Alliance for Astroparticle Physics (HAP), Initiative and Networking Fund of the Helmholtz AssociationSwedish Research CouncilSwedish Polar Research SecretariatKnut and Alice Wallenberg FoundationEuropean Union-EGI Advanced ComputingAustralian Research Council (Australia)WestGridVillum FondenCarlsberg FoundationEuropean Commission (Denmark)Marsden FundJapan Society for Promotion of Science (JSPS)National Research Foundation of Korea (NRF)Swiss National Science Foundation (SNSF) (Switzerland)
The authors gratefully acknowledge the support from the following agencies and institutions: U.S. National Science Foundation-Office of Polar Programs, U.S. National Science Foundation-Physics Division, U.S. National Science Foundation-EPSCoR, U.S. National Science Foundation-Office of Advanced Cyberinfrastructure, Wisconsin Alumni Research Foundation, Center for High Throughput Computing (CHTC) at the University of Wisconsin-Madison, Open Science Grid (OSG), Partnership to Advance Throughput Computing (PATh), Advanced Cyberinfrastructure Coordination Ecosystem: Services & Support (ACCESS), Frontera and Ranch computing project at the Texas Advanced Computing Center, U.S. Department of Energy-National Energy Research Scientific Computing Center, Particle astrophysics research computing center at the University of Maryland, Institute for Cyber-Enabled Research at Michigan State University, Astroparticle physics computational facility at Marquette University, NVIDIA Corporation, and Google Cloud Platform (USA); BFunds for Scientific Research (FRS-FNRS and FWO), FWO Odysseus and Big Science programs, and Belgian Federal Science Policy Office (Belspo) (Belgium); Bundesministerium fur Bildung und Forschung (BMBF), Deutsche Forschungsgemeinschaft (DFG), Helmholtz Alliance for Astroparticle Physics (HAP), Initiative and Networking Fund of the Helmholtz Association, Deutsches Elektronen Synchrotron (DESY), and High Performance Computing cluster of the RWTH Aachen (Germany); Swedish Research Council, Swedish Polar Research Secretariat, Swedish National Infrastructure for Computing (SNIC), and Knut and Alice Wallenberg Foundation; European Union-EGI Advanced Computing for research (Sweden); Australian Research Council (Australia); Natural Sciences and Engineering Research Council of Canada, Calcul Quebec, Compute Ontario, Canada Foundation for Innovation, WestGrid, and Digital Research Alliance of Canada (Canada); Villum Fonden, Carlsberg Foundation, and European Commission (Denmark); Marsden Fund (New Zealand); Japan Society for Promotion of Science (JSPS) and Institute for Global Prominent Research (IGPR) of Chiba University (Japan); National Research Foundation of Korea (NRF) (Korea); and Swiss National Science Foundation (SNSF) (Switzerland).
- Language
- English
- Date published
- 07/2025
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984947246302771
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