Measurement of the Atmospheric Muon Charge Ratio at TeV Energies with MINOS

A measurement of the atmospheric muon charge ratio with the MINOS far detector is presented. The 5.4 kilo-ton MINOS far detector is located at a depth of ~710 meters underground in the Soudan mine in Minnesota. It was designed to study neutrino oscillations with the Fermilab NuMI beam in conjunction with a near detector 1 km downstream of the NuMI target. The far detector has been taking charge-separated cosmic ray data since August 2003. We measure the atmospheric muon charge ratio for underground muon energies up to 250 GeV which corresponds to a surface energy range between 1 and 7 TeV.