Journal
PHYSICAL REVIEW D
Volume 88, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.88.112008
Keywords
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Funding
- U.S. National Science Foundation - Office of Polar Programs
- U.S. National Science Foundation - Physics Division
- University of Wisconsin Alumni Research Foundation
- Grid Laboratory Of Wisconsin (GLOW) grid infrastructure at the University of Wisconsin Madison
- Open Science Grid (OSG) grid infrastructure
- U.S. Department of Energy
- National Energy Research Scientific Computing Center
- Louisiana Optical Network Initiative (LONI)
- Natural Sciences and Engineering Research Council of Canada
- WestGrid and Compute/Calcul Canada
- Swedish Research Council
- Swedish Polar Research Secretariat
- Swedish National Infrastructure for Computing (SNIC)
- Knut and Alice Wallenberg Foundation, Sweden
- German Ministry for Education and Research (BMBF)
- Deutsche Forschungsgemeinschaft (DFG)
- Helmholtz Alliance for Astroparticle Physics (HAP)
- Research Department of Plasmas with Complex Interactions (Bochum), Germany
- Fund for Scientific Research (FNRS-FWO)
- FWO Odysseus Programme
- Flanders Institute to encourage scientific and technological research in industry (IWT)
- Belgian Federal Science Policy Office (Belspo)
- University of Oxford, United Kingdom
- Marsden Fund, New Zealand
- Australian Research Council
- Japan Society for Promotion of Science (JSPS)
- Swiss National Science Foundation (SNSF), Switzerland
- National Research Foundation of Korea (NRF)
- Direct For Mathematical & Physical Scien [1210052] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1205403, 1205807, 1307472] Funding Source: National Science Foundation
- Division Of Physics [1210052] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0969661, 1306958] Funding Source: National Science Foundation
- Science and Technology Facilities Council [PP/C506205/1, ST/J000507/1] Funding Source: researchfish
- STFC [PP/C506205/1, ST/J000507/1] Funding Source: UKRI
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We have searched for extremely high energy neutrinos using data taken with the IceCube detector between May 2010 and May 2012. Two neutrino-induced particle shower events with energies around 1 PeV were observed, as reported previously. In this work, we investigate whether these events could originate from cosmogenic neutrinos produced in the interactions of ultrahigh energy cosmic rays with ambient photons while propagating through intergalactic space. Exploiting IceCube's large exposure for extremely high energy neutrinos and the lack of observed events above 100 PeV, we can rule out the corresponding models at more than 90% confidence level. The model-independent quasidifferential 90% C. L. upper limit, which amounts to E-2 phi(nu e)+(nu mu)+(nu tau) = 1.2 x 10(-7) GeV cm(-2) s(-1) sr(-1) at 1 EeV, provides the most stringent constraint in the energy range from 10 PeV to 10 EeV. Our observation disfavors strong cosmological evolution of the highest energy cosmic-ray sources such as the Fanaroff-Riley type II class of radio galaxies.
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