Measurement of the underground atmospheric muon charge ratio using the MINOS Near Detector

Creators: Adamson, P.; Himmel, A.; Michael, D. G.; Mualem, L.; Newman, H. B.; Orchanian, M.; Patterson, R. B.; MINOS Collaboration

Abstract

The magnetized MINOS Near Detector, at a depth of 225 mwe, is used to measure the atmospheric muon charge ratio. The ratio of observed positive to negative atmospheric muon rates, using 301 days of data, is measured to be 1.266±0.001(stat)_(-0.014)^(+0.015)(syst). This measurement is consistent with previous results from other shallow underground detectors and is 0.108±0.019(stat+syst) lower than the measurement at the functionally identical MINOS Far Detector at a depth of 2070 mwe. This increase in charge ratio as a function of depth is consistent with an increase in the fraction of muons arising from kaon decay for increasing muon surface energies

Additional Information

© 2011 American Physical Society. Received 16 December 2010; published 28 February 2011. This work was supported by the U.S. DOE, the United Kingdom STFC, the U.S. NSF, the State and University of Minnesota, the University of Athens, Greece, and Brazil's FAPESP and CNPq. We are grateful to the Minnesota Department of Natural Resources, the crew of Soudan Underground Laboratory, and the staff of Fermilab for their contributions to this effort.

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