New limits on neutrino decay from high-energy astrophysical neutrinos - INSPIRE

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New limits on neutrino decay from high-energy astrophysical neutrinos

Victor B. Valera
(
- Bohr Inst.
)
,
Damiano F.G. Fiorillo
(
- Bohr Inst.
)
,
Ivan Esteban
(
- Basque U., Bilbao
)
,
Mauricio Bustamante
(
- Bohr Inst.
)

May 23, 2024

20 pages

Published in:

Phys.Rev.D 110 (2024) 4, 043004

Published: Aug 2, 2024

e-Print:

2405.14826 [astro-ph.HE]

DOI:

10.1103/PhysRevD.110.043004 (publication)

View in:

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Abstract: (APS)

Since neutrinos have mass differences they could decay into one another, but their lifetimes are likely long, even when shortened by new physics, so decay likely impacts neutrinos only during long trips. This makes high-energy astrophysical neutrinos, traveling for up to billions of light years, sensitive probes of decay. However, their sensitivity must be tempered by reality. We derive from them thorough bounds on the neutrino lifetimes accounting for critical astrophysical unknowns and the nuances of neutrino detection. Using the diffuse neutrino flux, we disfavor lifetimes

τ ≲ 20 - 450 s (m / eV)

, based on present IceCube data, and forecast factor-of-10 improvements by upcoming detectors. Using, for the first time, neutrinos from the active galaxy NGC 1068, extant unknowns preclude placing lifetime bounds today, but upcoming detectors could disfavor

τ \sim 100 - 5000 s (m / eV)

.

Note:

20 pages, 6 figures, 2 tables, plus appendices

neutrino: flux
neutrino: decay
neutrino: lifetime
IceCube
sensitivity
galaxy
mass difference
new physics

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