Pseudo-Dirac neutrinos and relic neutrino matter effect on the high-energy neutrino flavor composition
We show that if neutrinos are pseudo-Dirac, they can potentially affect the flavor ratio predictions for the high-energy astrophysical neutrino flux observed by IceCube. In this context, we point out a novel matter effect induced by the cosmic neutrino background (CνB) on the flavor ratio compositio...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-03-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269325000668 |
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| author | P.S. Bhupal Dev Pedro A.N. Machado Ivan Martínez-Soler |
| author_facet | P.S. Bhupal Dev Pedro A.N. Machado Ivan Martínez-Soler |
| author_sort | P.S. Bhupal Dev |
| collection | DOAJ |
| description | We show that if neutrinos are pseudo-Dirac, they can potentially affect the flavor ratio predictions for the high-energy astrophysical neutrino flux observed by IceCube. In this context, we point out a novel matter effect induced by the cosmic neutrino background (CνB) on the flavor ratio composition. Specifically, the active-sterile neutrino oscillations over the astrophysical baseline lead to an energy-dependent flavor ratio at Earth due to the CνB matter effect, which is in principle distinguishable from the vacuum oscillation effect, provided there is an asymmetry between the neutrino and antineutrino number densities, as well as a local CνB overdensity. Considering the projected precision of the 3-neutrino oscillation parameter measurements and improved flavor triangle measurements, we show that the next-generation neutrino telescopes, such as KM3NeT and IceCube-Gen2, can in principle probe the pseudo-Dirac neutrino hypothesis and the CνB matter effect. |
| format | Article |
| id | doaj-art-605a1295ea1a4aa2b847c118867848f5 |
| institution | Kabale University |
| issn | 0370-2693 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj-art-605a1295ea1a4aa2b847c118867848f52025-02-08T04:59:29ZengElsevierPhysics Letters B0370-26932025-03-01862139306Pseudo-Dirac neutrinos and relic neutrino matter effect on the high-energy neutrino flavor compositionP.S. Bhupal Dev0Pedro A.N. Machado1Ivan Martínez-Soler2Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130, USA; Corresponding author.Theoretical Physics Department, Fermilab, P.O. Box 500, Batavia, IL 60510, USAInstitute for Particle Physics Phenomenology, Durham University, South Road, DH1 3LE, Durham, UKWe show that if neutrinos are pseudo-Dirac, they can potentially affect the flavor ratio predictions for the high-energy astrophysical neutrino flux observed by IceCube. In this context, we point out a novel matter effect induced by the cosmic neutrino background (CνB) on the flavor ratio composition. Specifically, the active-sterile neutrino oscillations over the astrophysical baseline lead to an energy-dependent flavor ratio at Earth due to the CνB matter effect, which is in principle distinguishable from the vacuum oscillation effect, provided there is an asymmetry between the neutrino and antineutrino number densities, as well as a local CνB overdensity. Considering the projected precision of the 3-neutrino oscillation parameter measurements and improved flavor triangle measurements, we show that the next-generation neutrino telescopes, such as KM3NeT and IceCube-Gen2, can in principle probe the pseudo-Dirac neutrino hypothesis and the CνB matter effect.http://www.sciencedirect.com/science/article/pii/S0370269325000668 |
| spellingShingle | P.S. Bhupal Dev Pedro A.N. Machado Ivan Martínez-Soler Pseudo-Dirac neutrinos and relic neutrino matter effect on the high-energy neutrino flavor composition Physics Letters B |
| title | Pseudo-Dirac neutrinos and relic neutrino matter effect on the high-energy neutrino flavor composition |
| title_full | Pseudo-Dirac neutrinos and relic neutrino matter effect on the high-energy neutrino flavor composition |
| title_fullStr | Pseudo-Dirac neutrinos and relic neutrino matter effect on the high-energy neutrino flavor composition |
| title_full_unstemmed | Pseudo-Dirac neutrinos and relic neutrino matter effect on the high-energy neutrino flavor composition |
| title_short | Pseudo-Dirac neutrinos and relic neutrino matter effect on the high-energy neutrino flavor composition |
| title_sort | pseudo dirac neutrinos and relic neutrino matter effect on the high energy neutrino flavor composition |
| url | http://www.sciencedirect.com/science/article/pii/S0370269325000668 |
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