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Sterile neutrinos in astrophysical neutrino flavor

Sterile neutrinos in astrophysical neutrino flavor
Sterile neutrinos in astrophysical neutrino flavor
In this paper, we study the effect of active-neutrino-sterile-neutrino mixing in the expected high-energy astrophysical neutrino flavor content. Non-unitarity in the measurement of the three-active neutrinos can be due to the existence of sterile neutrino states. We introduce the concept of the four-flavor tetrahedron in order to visualize the lack of unitarity in the astrophysical neutrino three-flavor triangle. We demonstrate that active-sterile neutrino mixings modify the allowed region of the astrophysical flavor ratio from the standard case. However, a projection of the four-flavor tetrahedron has restrictions of phase space similar to the three-flavor triangle. On the other hand, the initial presence of astrophysical sterile neutrinos drastically changes the scenario, and it allows an apparent unitarity violation in the three-flavor triangle space. Using current global fit constraints including the non-unitarity case, we also illustrate the allowed astrophysical neutrino flavor ratios. Thus, the measurement of the high-energy astrophyscal neutrino flavor content allows us to explore sterile neutrinos independently of the sterile neutrino mass scale. These are topics of investigation for current and future neutrino telescopes.
1475-7516
Farrag, Kareem Ramadan Hassan Aly Muhammad
0d181def-4c75-40d8-b872-3d0a51ca8892
Farrag, Kareem Ramadan Hassan Aly Muhammad
0d181def-4c75-40d8-b872-3d0a51ca8892

Farrag, Kareem Ramadan Hassan Aly Muhammad (2020) Sterile neutrinos in astrophysical neutrino flavor. Journal of Cosmology and Astroparticle Physics. (doi:10.1088/1475-7516/2020/02/015).

Record type: Article

Abstract

In this paper, we study the effect of active-neutrino-sterile-neutrino mixing in the expected high-energy astrophysical neutrino flavor content. Non-unitarity in the measurement of the three-active neutrinos can be due to the existence of sterile neutrino states. We introduce the concept of the four-flavor tetrahedron in order to visualize the lack of unitarity in the astrophysical neutrino three-flavor triangle. We demonstrate that active-sterile neutrino mixings modify the allowed region of the astrophysical flavor ratio from the standard case. However, a projection of the four-flavor tetrahedron has restrictions of phase space similar to the three-flavor triangle. On the other hand, the initial presence of astrophysical sterile neutrinos drastically changes the scenario, and it allows an apparent unitarity violation in the three-flavor triangle space. Using current global fit constraints including the non-unitarity case, we also illustrate the allowed astrophysical neutrino flavor ratios. Thus, the measurement of the high-energy astrophyscal neutrino flavor content allows us to explore sterile neutrinos independently of the sterile neutrino mass scale. These are topics of investigation for current and future neutrino telescopes.

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Sterile Neutrinos in Astrophysical Neutrino Flavor - Accepted Manuscript
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e-pub ahead of print date: 13 February 2020
Published date: 2 May 2020

Identifiers

Local EPrints ID: 441011
URI: http://eprints.soton.ac.uk/id/eprint/441011
ISSN: 1475-7516
PURE UUID: b882b469-5a0c-418e-8f10-5f2b5be8db09

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Date deposited: 27 May 2020 16:54
Last modified: 17 Mar 2024 05:34

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