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Title: How unequal fluxes of high energy astrophysical neutrinos and antineutrinos can fake new physics

Abstract

Flavor ratios of very high energy astrophysical neutrinos, which can be studied at the Earth by a neutrino telescope such as IceCube, can serve to diagnose their production mechanism at the astrophysical source. The flavor ratios for neutrinos and antineutrinos can be quite different as we do not know how they are produced in the astrophysical environment. Due to this uncertainty the neutrino and antineutrino flavor ratios at the Earth also could be quite different. Nonetheless, it is generally assumed that flavor ratios for neutrinos and antineutrinos are the same at the Earth, in fitting the high energy astrophysical neutrino data. This is a reasonable assumption for the limited statistics for the data we currently have. However, in the future the fit must be performed allowing for a possible discrepancy in these two fractions in order to be able to disentangle different production mechanisms at the source from new physics in the neutrino sector. To reinforce this issue, in this work we show that a wrong assumption about the distribution of neutrino flavor ratios at the Earth may indeed lead to misleading interpretations of IceCube results.

Authors:
 [1]; ;  [2]
  1. Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, C.P. 38071, 22452-970, Rio de Janeiro (Brazil)
  2. Instituto de Física, Universidade de São Paulo, C.P. 66.318, 05315-970 São Paulo (Brazil)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22572169
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2016; Journal Issue: 10; Other Information: PUBLISHER-ID: JCAP10(2016)036; OAI: oai:repo.scoap3.org:17595; cc-by Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANTINEUTRINOS; ASTROPHYSICS; COSMIC NEUTRINOS; FLAVOR MODEL; NEUTRINO DETECTION; PARTICLE PRODUCTION; TELESCOPE COUNTERS; ICECUBE NEUTRINO DETECTOR; NEUTRINO DETECTORS

Citation Formats

Nunokawa, Hiroshi, Panes, Boris, and Funchal, Renata Zukanovich. How unequal fluxes of high energy astrophysical neutrinos and antineutrinos can fake new physics. United States: N. p., 2016. Web. doi:10.1088/1475-7516/2016/10/036.
Nunokawa, Hiroshi, Panes, Boris, & Funchal, Renata Zukanovich. How unequal fluxes of high energy astrophysical neutrinos and antineutrinos can fake new physics. United States. doi:10.1088/1475-7516/2016/10/036.
Nunokawa, Hiroshi, Panes, Boris, and Funchal, Renata Zukanovich. Fri . "How unequal fluxes of high energy astrophysical neutrinos and antineutrinos can fake new physics". United States. doi:10.1088/1475-7516/2016/10/036.
@article{osti_22572169,
title = {How unequal fluxes of high energy astrophysical neutrinos and antineutrinos can fake new physics},
author = {Nunokawa, Hiroshi and Panes, Boris and Funchal, Renata Zukanovich},
abstractNote = {Flavor ratios of very high energy astrophysical neutrinos, which can be studied at the Earth by a neutrino telescope such as IceCube, can serve to diagnose their production mechanism at the astrophysical source. The flavor ratios for neutrinos and antineutrinos can be quite different as we do not know how they are produced in the astrophysical environment. Due to this uncertainty the neutrino and antineutrino flavor ratios at the Earth also could be quite different. Nonetheless, it is generally assumed that flavor ratios for neutrinos and antineutrinos are the same at the Earth, in fitting the high energy astrophysical neutrino data. This is a reasonable assumption for the limited statistics for the data we currently have. However, in the future the fit must be performed allowing for a possible discrepancy in these two fractions in order to be able to disentangle different production mechanisms at the source from new physics in the neutrino sector. To reinforce this issue, in this work we show that a wrong assumption about the distribution of neutrino flavor ratios at the Earth may indeed lead to misleading interpretations of IceCube results.},
doi = {10.1088/1475-7516/2016/10/036},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 10,
volume = 2016,
place = {United States},
year = {Fri Oct 21 00:00:00 EDT 2016},
month = {Fri Oct 21 00:00:00 EDT 2016}
}