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Title: IceCube’s astrophysical neutrino energy spectrum from C P T violation

Abstract

The six-year data set of high-energy starting events (HESEs) at IceCube indicates a spectrum of astrophysical neutrinos much softer than expected from the Fermi shock acceleration mechanism. On the other hand, IceCube’s up-going muon neutrino data set and Fermi-LAT’s gamma-ray spectrum point to an E-2 neutrino spectrum. If the HESE data above 200 TeV are fit with the latter flux, an excess at lower energies ensues, which then suggests a multicomponent spectrum. We show that the HESE data set can be explained by a single E-2 power-law neutrino flux from a muon-damped p γ source if neutrino interactions are modified by C P T violation. The low-energy excess is naturally explained by the pileup of events from superluminal neutrino decay, and there is no cutoff at high energies due to the contribution of subluminal antineutrinos. The best-fit scenario with C P T violation also predicts the observation of Glashow resonance events in the near future.

Authors:
;
Publication Date:
Research Org.:
Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1422648
Alternate Identifier(s):
OSTI ID: 1498834
Grant/Contract Number:  
SC0010504
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 97 Journal Issue: 4; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Liao, Jiajun, and Marfatia, Danny. IceCube’s astrophysical neutrino energy spectrum from CPT violation. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.041302.
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Liao, Jiajun, & Marfatia, Danny. IceCube’s astrophysical neutrino energy spectrum from CPT violation. United States. doi:10.1103/PhysRevD.97.041302.
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Liao, Jiajun, and Marfatia, Danny. Mon . "IceCube’s astrophysical neutrino energy spectrum from CPT violation". United States. doi:10.1103/PhysRevD.97.041302.
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@article{osti_1422648,
title = {IceCube’s astrophysical neutrino energy spectrum from CPT violation},
author = {Liao, Jiajun and Marfatia, Danny},
abstractNote = {The six-year data set of high-energy starting events (HESEs) at IceCube indicates a spectrum of astrophysical neutrinos much softer than expected from the Fermi shock acceleration mechanism. On the other hand, IceCube’s up-going muon neutrino data set and Fermi-LAT’s gamma-ray spectrum point to an E-2 neutrino spectrum. If the HESE data above 200 TeV are fit with the latter flux, an excess at lower energies ensues, which then suggests a multicomponent spectrum. We show that the HESE data set can be explained by a single E-2 power-law neutrino flux from a muon-damped p γ source if neutrino interactions are modified by C P T violation. The low-energy excess is naturally explained by the pileup of events from superluminal neutrino decay, and there is no cutoff at high energies due to the contribution of subluminal antineutrinos. The best-fit scenario with C P T violation also predicts the observation of Glashow resonance events in the near future.},
doi = {10.1103/PhysRevD.97.041302},
journal = {Physical Review D},
number = 4,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}
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Journal Article:
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DOI: 10.1103/PhysRevD.97.041302
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Cited by: 3 works
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Figures / Tables:

Figure 1 Figure 1: The total flux of astrophysical neutrinos as a function of neutrino energy. The data points are extracted from six-year HESE data assuming a 1∶1∶1 flavor ratio and an E−2 spectrum and independent normalization in each energy bin [3]. The gray horizontal line shows the best fit to HESEmore » data with deposited energy above 200 TeV for an E−2 spectrum and 1∶1∶1 flavor ratio; the total flux is given by E2Φ = 0.66 × 10−8 GeV cm−2 s−1 sr−1. The black solid curve corresponds to the total flux on Earth for the best-fit CPTV scenario. The blue dashed (red dotted) curve corresponds to the superluminal neutrino (subluminal antineutrino) component. Here, we assume a muon-damped pγ source with an E−2 spectrum. The initial fraction of the superluminal neutrinos is 80% and Eth = 1.2 PeV. The final total flux is normalized to E2Φ = 3.6 × 10−8 GeV cm−2 s−1 sr−1 at E = 10 TeV.« less
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