Abstract
A measurement is presented of the flux ratio of positive and negative muons from cosmic ray interactions in the atmosphere, using data collected by the CMS detector at ground level and in the underground experimental cavern. The excellent performance of the CMS detector allowed detection of muons in the momentum range from 5GeV/c to 1TeV/c. For muon momenta below 100GeV/c the flux ratio is measured to be a constant 1.2766 +/-0.0032(stat.) +/-0.0032(syst.), the most precise measurement to date. At higher momenta an increase in the charge ratio is observed, in agreement with models of muon production in cosmic ray showers and compatible with previous measurements by deep underground experiments.
Highlights
A measurement is presented of the flux ratio of positive and negative muons from cosmic ray interactions in the atmosphere, using data collected by the CMS detector at ground level and in the underground experimental cavern
The flux ratio R of positive to negative muons of cosmic ray interactions in the atmosphere is measured with the CMS detector [1]
The Measurement is based on 3.3 · stand-alone muon track events taken with the muon drift tube chambers of the CMS detector at ground level in 2006 as well as 1.6 · stand-alone muon events and 2.45 · 105 global muon events, requiring a match to the central tracking system of the CMS detector, in the underground experimental cavern in 2008
Summary
A measurement is presented of the flux ratio of positive and negative muons from cosmic ray interactions in the atmosphere, using data collected by the CMS detector at ground level and in the underground experimental cavern. 35th International Conference of High Energy Physics - ICHEP2010, July 22-28, 2010 Measurement of the charge ratio of atmospheric muons with the CMS detector
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