Title: " Measuring energy dependence of the atmospheric muon charge ratio with MINOS"

Abstract:

The MINOS Far and Near Detectors have been collecting charge separated cosmic ray muons since August 2003 and January 2005 respectively. Sampling different surface energy scales by being situated at different slant depths the MINOS experiment has observed a substantial increase in the atmospheric muon charge ratio from 1.288+/-0.004(stat)+/-0.025(syst) at 50-300 GeV in the Near Detector to 1.374+/-0.004(stat)+0.012-0.010(syst) at 1-7 TeV in the Far Detector."