From 11.4 years of IceCube starting events with a new tau-neutrino double-cascade classification, the astrophysical flavor ratio at Earth is measured as 0.30:0.37:0.33, with all three flavors nonzero at 68% CL for the first time.
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Measurement of the Three-Flavor Composition of Astrophysical Neutrinos with Contained IceCube Events
From 11.4 years of IceCube starting events with a new tau-neutrino double-cascade classification, the astrophysical flavor ratio at Earth is measured as 0.30:0.37:0.33, with all three flavors nonzero at 68% CL for the first time.