Astrophys. Space Sci. Trans., 7, 79-83, 2011
www.astrophys-space-sci-trans.net/7/79/2011/
doi:10.5194/astra-7-79-2011
© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
 
14 Mar 2011
Measurement of the charge ratio of atmospheric muons with the CMS detector
A. Calderón for the CMS Collaboration
Instituto de Física de Cantabria (CSIC-UC), Santander, Spain

Abstract. We present a measurement of the ratio of positive to negative muon fluxes from cosmic ray interactions in the atmosphere, using data collected by the CMS detector both at ground level and in the underground experimental cavern at the CERN LHC. Muons were detected in the momentum range from 5 GeV/c to 1 TeV/c. The surface flux ratio is measured to be 1.2766 ± 0.0032 (stat.) ± 0.0032 (syst.), independent of the muon momentum, below 100 GeV/c. This is the most precise measurement to date. At higher momenta the data are consistent with an increase of the charge ratio, in agreement with cosmic ray shower models and compatible with previous measurements by underground experiments.

Citation: Calderón for the CMS Collaboration, A.: Measurement of the charge ratio of atmospheric muons with the CMS detector, Astrophys. Space Sci. Trans., 7, 79-83, doi:10.5194/astra-7-79-2011, 2011.
 
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