Journal
PHYSICAL REVIEW D
Volume 99, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.99.032004
Keywords
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Funding
- U.S. National Science Foundation Office of Polar Programs (U.S.A.)
- U.S. National Science Foundation-Physics Division (U.S.A.)
- Wisconsin Alumni Research Foundation (U.S.A.)
- Center for High Throughput Computing at the University of Wisconsin-Madison (U.S.A.)
- Open Science Grid (U.S.A.)
- Extreme Science and Engineering Discovery Environment (U.S.A.)
- U.S. Department of Energy-National Energy Research Scientific Computing Center (U.S.A.)
- Particle Astrophysics Research Computing Center at the University of Maryland (U.S.A.)
- Institute for Cyber-Enabled Research at Michigan State University (U.S.A.)
- Astroparticle Physics Computational Facility at Marquette University (U.S.A.)
- Funds for Scientific Research (FRS-FNRS) (Belgium)
- Funds for Scientific Research (FWO) (Belgium)
- FWO Odysseus program (Belgium)
- FWO Big Science program (Belgium)
- Belgian Federal Science Policy Office (Belspo) (Belgium)
- Bundesministerium fur Bildung und Forschung (Germany)
- Deutsche Forschungsgemeinschaft (Germany)
- Helmholtz Alliance for Astroparticle Physics (Germany)
- Initiative and Networking Fund of the Helmholtz Association (Germany)
- Deutsches Elektronen Synchrotron (Germany)
- High Performance Computing cluster of the RWTH Aachen (Germany)
- Swedish Research Council (Sweden)
- Swedish Polar Research Secretariat (Sweden)
- Swedish National Infrastructure for Computing (Sweden)
- Knut and Alice Wallenberg Foundation (Sweden)
- Australian Research Council
- Natural Sciences and Engineering Research Council of Canada (Canada)
- Calcul Quebec (Canada)
- Compute Ontario (Canada)
- Canada Foundation for Innovation (Canada)
- WestGrid (Canada)
- Compute Canada (Canada)
- Villum Fonden (Denmark)
- Danish National Research Foundation (Denmark)
- Marsden Fund (New Zealand)
- Japan Society for Promotion of Science (Japan)
- Institute for Global Prominent Research of Chiba University (Japan)
- National Research Foundation of Korea
- Swiss National Science Foundation
- STFC [ST/P000770/1] Funding Source: UKRI
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Inelasticity, the fraction of a neutrino's energy transferred to hadrons, is a quantity of interest in the study of astrophysical and atmospheric neutrino interactions at multi-TeV energies with IceCube. In this work, a sample of contained neutrino interactions in IceCube is obtained from five years of data and classified as 2650 tracks and 965 cascades. Tracks arise predominantly from charged-current nu(mu) interactions, and we demonstrate that we can reconstruct their energy and inelasticity. The inelasticity distribution is found to be consistent with the calculation of Cooper-Sarkar et al. across the energy range from similar to 1 to similar to 100 TeV. Along with cascades from neutrinos of all flavors, we also perform a fit over the energy, zenith angle, and inelasticity distribution to characterize the flux of astrophysical and atmospheric neutrinos. The energy spectrum of diffuse astrophysical neutrinos is described well by a power law in both track and cascade samples, and a best-fit index gamma = 2.62 +/- 0.07 is found in the energy range from 3.5 TeV to 2.6 PeV. Limits are set on the astrophysical flavor composition and are compatible with a ratio of (1/3 : 1/3 : 1/3)(circle plus). Exploiting the distinct inelasticity distribution of nu(mu) and (nu) over bar (mu) interactions, the atmospheric nu(mu) to (nu) over bar (mu) flux ratio in the energy range from 770 GeV to 21 TeV is found to be 0.77(-0.25)(+0.44) times the calculation by Honda et al. Lastly, the inelasticity distribution is also sensitive to neutrino charged-current charm production. The data are consistent with a leading-order calculation, with zero charm production excluded at 91% confidence level. Future analyses of inelasticity distributions may probe new physics that affects neutrino interactions both in and beyond the Standard Model.
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