Abstract
Measurement of the charge ratio of atmospheric muons with the CMS detector
Highlights
Cosmic-muon charge ratio is the ratio of the number of positive to negative-charge atmospheric muons arriving at the Earth’s surface, which originate from the showers produced by interactions of high-energy cosmic-ray particles with air nuclei in the upper layers of the atmosphere
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 Compact Muon Solenoid (CMS) detector both at ground level and in the underground experimental cavern at the CERN Large Hadron Collider (LHC)
The Compact Muon Solenoid (CMS) [6] is one of the detectors installed at the Large Hadron Collider (LHC) [7] at CERN
Summary
Cosmic-muon charge ratio is the ratio of the number of positive to negative-charge atmospheric muons arriving at the Earth’s surface, which originate from the showers produced by interactions of high-energy cosmic-ray particles with air nuclei in the upper layers of the atmosphere. Measurements from previous experiments [1,2,3,4,5] show this ratio to be constant up to a vertical muon momentum of about 200 GeV/c, and to increase significantly at higher momenta, due to the additional contribution of muons from kaon decays. These measurements are used to constrain parameters relevant to hadronic interactions and to better predict the atmospheric neutrino flux. Y x tracker Run 4406, Oct 2006 global-muon track (bottom half) standalone-muon track (in bottom sector)
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