Flavors of astrophysical neutrinos with active-sterile mixing
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Flavors of astrophysical neutrinos with active-sterile mixing. / Ahlers, Markus; Bustamante, Mauricio; Willesen, Niels Gustav Nortvig.
I: Journal of Cosmology and Astroparticle Physics, Bind 2021, Nr. 7, 029, 15.07.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Flavors of astrophysical neutrinos with active-sterile mixing
AU - Ahlers, Markus
AU - Bustamante, Mauricio
AU - Willesen, Niels Gustav Nortvig
PY - 2021/7/15
Y1 - 2021/7/15
N2 - We revisit the flavor composition of high-energy astrophysical neutrinos observed at neutrino telescopes. Assuming unitary time evolution of the neutrino flavor states, the flavor composition observable at Earth is related to the initial composition at their sources via oscillation-averaged flavor transitions. In a previous study we derived general bounds on the flavor composition of TeV-PeV astrophysical neutrinos assuming three-flavor unitary mixing. We extend these bounds to the case of active-sterile neutrino mixing. Our bounds are analytical, derived based only on the unitarity of the mixing, and do not require sampling over the values of the unknown active-sterile mixing parameters. These bounds apply to any extended active-sterile neutrino mixing scenario where energy-dependent nonstandard flavor mixing dominates over the standard mixing observed in accelerator, reactor, and atmospheric neutrino oscillations.
AB - We revisit the flavor composition of high-energy astrophysical neutrinos observed at neutrino telescopes. Assuming unitary time evolution of the neutrino flavor states, the flavor composition observable at Earth is related to the initial composition at their sources via oscillation-averaged flavor transitions. In a previous study we derived general bounds on the flavor composition of TeV-PeV astrophysical neutrinos assuming three-flavor unitary mixing. We extend these bounds to the case of active-sterile neutrino mixing. Our bounds are analytical, derived based only on the unitarity of the mixing, and do not require sampling over the values of the unknown active-sterile mixing parameters. These bounds apply to any extended active-sterile neutrino mixing scenario where energy-dependent nonstandard flavor mixing dominates over the standard mixing observed in accelerator, reactor, and atmospheric neutrino oscillations.
KW - neutrino astronomy
KW - neutrino properties
KW - ultra high energy photons and neutrinos
KW - OSCILLATIONS
U2 - 10.1088/1475-7516/2021/07/029
DO - 10.1088/1475-7516/2021/07/029
M3 - Journal article
VL - 2021
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 7
M1 - 029
ER -
ID: 276703406