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Unitarity bounds of astrophysical neutrinos

Ahlers, Markus and Bustamante, Mauricio and Mu, Siqiao (2018) Unitarity bounds of astrophysical neutrinos. Physical Review D, 98 (12). Art. No. 123023. ISSN 2470-0010.

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The flavor composition of astrophysical neutrinos observed at neutrino telescopes is related to the initial composition at their sources via oscillation-averaged flavor transitions. If the time evolution of the neutrino flavor states is unitary, the probability of neutrinos changing flavor is solely determined by the unitary mixing matrix that relates the neutrino flavor and propagation eigenstates. In this paper we derive general bounds on the flavor composition of TeV–PeV astrophysical neutrinos based on unitarity constraints. These bounds are useful for studying the flavor composition of high-energy neutrinos, where energy-dependent nonstandard flavor mixing can dominate over the standard mixing observed in accelerator, reactor, and atmospheric neutrino oscillations.

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Additional Information:© 2018 American Physical Society. (Received 8 October 2018; published 28 December 2018) We would like to thank Guoyuan Huang for useful comments on our manuscript. M. A. and M. B. acknowledge support from Danmarks Grundforskningsfond (Project No. 1041811001) and Villum Fonden (Projects No. 18994 and No. 13164, respectively). S. M. would like to thank Thomas Greve and the Caltech SURF program for financial support.
Funding AgencyGrant Number
Danmarks Grundforskningsfond1041811001
Villum Fonden18994
Villum Fonden13164
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
Record Number:CaltechAUTHORS:20190102-092233093
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91969
Deposited By: George Porter
Deposited On:03 Jan 2019 16:03
Last Modified:03 Jan 2019 16:03

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