1ADAMSON 2012B reports the atmospheric neutrino results obtained with MINOS far detector in 2,553 live days (an exposure of 37.9 kton$\cdot{}$yr). This result is obtained with a sample of high resolution contained-vertex muons. The expected ratio is calculated with no neutrino oscillation.
2ADAMSON 2006 result is obtained with the MINOS far detector with an exposure of 4.54 kton yr. The expected ratio is calculated with no neutrino oscillation.
References:
ADAMSON
2012B
PR D86 052007
Measurements of Atmospheric Neutrinos and Antineutrinos in the MINOS Far Detector
ADAMSON
2006
PR D73 072002
First Observations of Separated Atmospheric ${{\mathit \nu}_{{{\mu}}}}$ and ${{\overline{\mathit \nu}}_{{{\mu}}}}$ Events in the MINOS Detector