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Strong Constraints on Neutrino Nonstandard Interactions from TeV-Scale ν_{μ} Disappearance at IceCube
R Abbasi1, M Ackermann2, J Adams3
1Department of Physics, Loyola University Chicago, Chicago, Illinois 60660, USA.
Physical Review Letters
|July 16, 2022
Summary
Researchers searched for nonstandard neutrino interactions (NSI) using IceCube data. The study found results consistent with no NSI, setting the strongest constraints to date on NSI parameters.
Area of Science:
- Particle Physics
- Astrophysics
- Neutrino Physics
Background:
- Neutrino oscillations are well-explained by the Standard Model, but searching for nonstandard neutrino interactions (NSI) can reveal new physics.
- Atmospheric neutrinos detected by IceCube provide a unique opportunity to probe neutrino interactions.
Purpose of the Study:
- To search for evidence of nonstandard neutrino interactions (NSI) using a large dataset of atmospheric muon neutrinos.
- To constrain the NSI parameter ε_{μτ} and test the consistency with the Standard Model.
Main Methods:
- Utilized eight years of TeV-scale atmospheric muon neutrino data from the IceCube Neutrino Observatory.
- Reconstructed incident energies and zenith angles for atmospheric neutrino events to analyze their behavior.
Main Results:
- The analysis yielded unified confidence intervals for the NSI parameter ε_{μτ}.
- The best-fit value for ε_{μτ} was found to be consistent with zero (no NSI) at a p-value of 25.2%.
Conclusions:
- This study provides the strongest constraints to date on any NSI parameter across all oscillation channels.
- The 90% confidence interval for ε_{μτ} is -0.0041≤ε_{μτ}≤0.0031, indicating no significant deviation from standard neutrino behavior.
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