Observation of Atmospheric Neutrino Oscillations in Soudan 2
The Soudan 2 Collaboration
TL;DR
This paper reports the observation of atmospheric muon neutrino oscillations using the Soudan 2 detector, providing statistical evidence and confidence regions for neutrino oscillation parameters.
Contribution
First observation of atmospheric neutrino oscillations in Soudan 2 with detailed statistical analysis and confidence region determination.
Findings
Probability of no oscillation hypothesis is 5.8x10^-4
Confidence region in sin^2(2θ) and Δm^2 parameters
Evidence supports neutrino oscillation phenomenon
Abstract
The effects of oscillations of atmospheric muon neutrinos are observed in the 5.90 fiducial kiloton-year exposure of the Soudan 2 detector. An unbinned maximum likelihood analysis of the neutrino L/E distribution has been carried out using the Feldman-Cousins prescription. The probability of the no oscillation hypothesis is 5.8x10-4. The 90% confidence allowed region in the sin**(2theta), Delta m**2 plane is presented.
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