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Abstract |
While conventional oscillation experiments measure neutrino mixing parameters with high precision, these measurements are strictly confined to sub-TeV scales. At higher energies, renormalization-group effects can cause these parameters to evolve with the transferred momentum, Q. High-energy and ultrahigh-energy astrophysical neutrinos, spanning TeV to EeV energies, probe high values of Q unreachable by conventional experiments, offering an unprecedented test of high-energy mixing. We use the flavor composition of these neutrinos-the relative proportions of nu e, nu mu, and nu tau-to constrain this evolution, both phenomenologically and within dimension-6 Standard Model effective field theory. We account for astrophysical uncertainties-an unavoidable requirement to obtain realistic results, even though this weakens the bounds. Although present IceCube measurements lack the sensitivity to detect this running, we forecast that upcoming multidetector combinations will place unprecedented bounds on the high-energy evolution of neutrino mixing. |
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