Charge-separated atmospheric neutrino-induced muons in the MINOS far detector

We found 140 neutrino-induced muonsin 854.24 live days in the MINOSfar detector. We looked for evidence of neutrino disappearance in this data set by computing the ratio of the number of low momentum muonsto the sum of the number of high momentum and unknown momentum muonsfor both data and Monte Carlo expectation in the absence of neutrino oscillations. The ratio of data and Monte Carlo ratios is consistent with an oscillation signal. A fit to the data for the oscillation parameters excludes the null oscillation hypothesis at the 94% confidence level. We separated the muonsby charge sign in both the data and Monte Carlo events and found the ratio of the total number of negative to positive muonsin both samples. The ratio of those ratios is a test of CPT conservation. The result is consistent with CPT conservation.