The University of Southampton
University of Southampton Institutional Repository

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.
0035-8711
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. Monthly Notices of the Royal Astronomical Society. (In Press)

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.

Text
Sterile Neutrinos in Astrophysical Neutrino Flavor - Accepted Manuscript
Download (4MB)

More information

Accepted/In Press date: 2 May 2020

Identifiers

Local EPrints ID: 441011
URI: http://eprints.soton.ac.uk/id/eprint/441011
ISSN: 0035-8711
PURE UUID: b882b469-5a0c-418e-8f10-5f2b5be8db09

Catalogue record

Date deposited: 27 May 2020 16:54
Last modified: 07 Oct 2020 06:17

Export record

Contributors

Author: Kareem Ramadan Hassan Aly Muhammad Farrag

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×