CPT conservation and atmospheric neutrinos in the MINOS far detector

The MINOS Far Detector is a 5400 ton iron calorimeter located at the Soudan state park in Soudan Minnesota. The MINOS far detector can observe atmospheric neutrinos and separate charge current nm and nm interactions by using a 1.4 T magnetic field to identify the charge of the produced muon. The CPT theorem requires that neutrinos and anti-neutrinos oscillate in the same way. In an fiducial exposure of 5.0 kilo-ton years a total of 41 candidate neutrino events are observed with an expectation of 53.1+/-7.6(system.)+/-7.2(stat.) unoscillated events or 31.6+/-4.7(system.)+/-5.6(stat.) events with Deltam2 = 2.4 x 10 -3eV2,sin 2(2theta) = 1.0 as oscillation parameters. These include 28 events which can have there charge identified with high confidence. These 28 events consist of 18 events consistent with being produced by nm and 10 events being consistent with being produced by nm . No evidence of CPT violation is observed.