Khachatryan VSirunyan AMTumasyan AAdam WBergauer TDragicevic MErö JFabjan CFriedl MFrühwirth RGhete VMHammer JHänsel SHoch MHörmann NHrubec JJeitler MKasieczka GKiesenhofer WKrammer MLiko DMikulec IPernicka MRohringer HSchöfbeck RStrauss JTaurok ATeischinger FWaltenberger WWalzel GWidl EWulz CEMossolov VShumeiko NSuarez Gonzalez JBenucci LCeard LDe Wolf EAHashemi MJanssen XMaes TMucibello LOchesanu SRoland BRougny RSelvaggi MVan Haevermaet HVan Mechelen PVan Remortel NAdler VBeauceron SBlyweert SD'Hondt JDevroede OKalogeropoulos AMaes JMaes MTavernier SVan Doninck WVan Mulders PVillella IChabert ECCharaf OClerbaux BDe Lentdecker GDero VGay APRHammad GHMarage PEVander Velde CVanlaer PWickens JCostantini SGrunewald MKlein BMarinov ARyckbosch DThyssen FTytgat MVanelderen LVerwilligen PWalsh SZaganidis NBasegmez SBruno GCaudron JDe Favereau De Jeneret JDelaere CDemin PFavart DGiammanco AGrégoire GHollar JLemaitre VMilitaru OOvyn SPagano DPin APiotrzkowski KQuertenmont L23/08/20101/01/2010PHYSICS LETTERS B, 2010, 692 (2), pp. 83 - 104 (22)0370-2693https://hdl.handle.net/10179/10022We 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 deep-underground experiments. © 2010.83 - 104 (22)Science & TechnologyPhysical SciencesAstronomy & AstrophysicsPhysics, NuclearPhysics, Particles & FieldsPhysicsPHYSICS, MULTIDISCIPLINARYCMSMuonCosmic raysCharge ratioSEA-LEVELFLUXJournal article10.1016/j.physletb.2010.07.033249530Massey_Dark0105 Mathematical Physics0201 Astronomical and Space Sciences0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics