Experimental study of high energy muons from Extensive Air Showers in the energy range 100 TeV to 10 PeV

The L3+C experiment at CERN combines a small Air Shower array with a high resolution muon spectrometer, located under 30 m of overburden. The measurement of the shower particle density combined with the measurement of cosmic ray induced muons in the L3 spectrometer allows for a detailed check of theoretical models of air shower creation and development