New limits on neutrino decay from high-energy astrophysical neutrinos

被引：1
作者：
Valera, Victor B. [1 ]
Fiorillo, Damiano F. G. [1 ]
Esteban, Ivan [2 ,3 ]
Bustamante, Mauricio [1 ]
机构：
[1] Univ Copenhagen, Niels Bohr Inst, Niels Bohr Int Acad, DK-2100 Copenhagen, Denmark
[2] Univ Basque Country UPV EHU, Dept Phys, POB 644, Bilbao 48080, Spain
[3] Univ Basque Country UPV EHU, EHU Quantum Ctr, Leioa, Spain
来源：
PHYSICAL REVIEW D | 2024年 / 110卷 / 04期
关键词：
FLAVOR RATIOS; COSMOLOGICAL CONSTRAINTS; GAMMA-RAY; OSCILLATIONS; MUON; FLUX; SPECTRUM; 1987A; BURST;
D O I：
10.1103/PhysRevD.110.043004
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 tau less than or similar to 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 tau similar to 100-5000 s (m=eV).
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页数：28
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