Strong Constraints on Neutrino Nonstandard Interactions from TeV-Scale $\nu_u$ Disappearance at IceCube

de Wasseige, Gwenhaël;IceCube;et.al.
(2022) Physical Review Letters — Vol. 129 (2022)

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Abstract
We report a search for nonstandard neutrino interactions (NSI) using eight years of TeV-scale atmospheric muon neutrino data from the IceCube Neutrino Observatory. By reconstructing incident energies and zenith angles for atmospheric neutrino events, this analysis presents unified confidence intervals for the NSI parameter <math display="inline"><msub><mi>ε</mi><mrow><mi>μ</mi><mi>τ</mi></mrow></msub></math>. The best-fit value is consistent with no NSI at a <math display="inline"><mi>p</mi></math> value of 25.2%. With a 90% confidence interval of <math display="inline"><mo>-</mo><mn>0.0041</mn><mo>≤</mo><msub><mi>ε</mi><mrow><mi>μ</mi><mi>τ</mi></mrow></msub><mo>≤</mo><mn>0.0031</mn></math> along the real axis and similar strength in the complex plane, this result is the strongest constraint on any NSI parameter from any oscillation channel to date.
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de Wasseige, G., IceCube, & et al. (2022). Strong Constraints on Neutrino Nonstandard Interactions from TeV-Scale $\nu_u$ Disappearance at IceCube. Physical Review Letters, 129. https://doi.org/10.1103/PhysRevLett.129.011804 (Original work published 2022)