Strong Constraints on Neutrino Nonstandard Interactions from TeV-Scale Disappearance at IceCube
R. Abbasi (Department of Physics, Loyola University Chicago, Chicago, Illinois 60660, USA); M. Ackermann (DESY, D-15738 Zeuthen, Germany); J. Adams (Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand); J. A. Aguilar (Université Libre de Bruxelles, Science Faculty CP230, B-1050 Brussels, Belgium); M. Ahlers (Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark); et al - Show all 385 authors
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 . The best-fit value is consistent with no NSI at a value of 25.2%. With a 90% confidence interval of 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.