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Search for Sterile Neutrinos in MINOS and MINOS+ Using a Two-Detector Fit.

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This study searched for sterile neutrinos by observing muon neutrino disappearance across two detectors. No evidence for sterile neutrino mixing was found, setting new limits on neutrino oscillation parameters.

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Area of Science:

  • Particle Physics
  • Neutrino Physics

Background:

  • Neutrino oscillations suggest neutrinos have mass.
  • The existence of light sterile neutrinos is hypothesized to explain anomalies in neutrino experiments.

Purpose of the Study:

  • To search for evidence of light sterile neutrinos by analyzing muon neutrino disappearance.
  • To constrain the mixing parameter sin²θ₂₄ within a 3+1 sterile neutrino model.

Main Methods:

  • Utilized a combined exposure from the MINOS and MINOS+ experiments.
  • Analyzed charged-current muon neutrino and neutral-current neutrino energy spectra at two detector baselines (1.04 km and 735 km).
  • Performed a simultaneous fit to the data from both detectors.

Main Results:

  • No evidence for sterile neutrino mixing was observed.
  • The analysis yielded no support for the 3+1 sterile neutrino model.

Conclusions:

  • The study sets the most stringent limits to date on the mixing parameter sin²θ₂₄ for Δm₄₁² > 10⁻⁴ eV².
  • The results disfavor the simplest sterile neutrino models at these mass scales.