Speaker
Dr
Gavin Hesketh
(CERN)
Description
A measurement is presented of the ratio of positive to negative muon fluxes from
cosmic-ray interactions in the atmosphere, using data collected by the CMS detector
at ground level and in the underground experimental cavern. Muons were detected in
the momentum range from 3 GeV/c to 1 TeV/c. For muon momenta below 100 GeV/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
asymmetry is observed, in agreement with models of muon production in cosmic-ray
showers and compatible with previous measurements by deep-underground experiments.
Primary author
Dr
Gavin Hesketh
(CERN)