Scientific article
Open access

Measurements using the inelasticity distribution of multi-TeV neutrino interactions in IceCube

ContributorsIceCube Collaboration
Published inPhysical Review. D, vol. 99, no. 3
  • Open Access - SCOAP3
Publication date2019

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 νμ 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 ∼1 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 γ=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 (13∶13∶13)⊕. Exploiting the distinct inelasticity distribution of νμ and ν¯μ interactions, the atmospheric νμ to ν¯μ 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.

Citation (ISO format)
IceCube Collaboration. Measurements using the inelasticity distribution of multi-TeV neutrino interactions in IceCube. In: Physical Review. D, 2019, vol. 99, n° 3. doi: 10.1103/PhysRevD.99.032004
Main files (1)
Article (Published version)
ISSN of the journal0556-2821

Technical informations

Creation03/04/2019 8:23:24 AM
First validation03/04/2019 8:23:24 AM
Update time03/15/2023 3:48:56 PM
Status update03/15/2023 3:48:56 PM
Last indexation02/12/2024 11:38:42 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack