Speaker
Description
Cosmic-ray muons are generated from the showers of secondary particles via the interactions of primary cosmic particles with air nuclei at the top of the atmosphere. Pions and kaons, which are generated from the interaction of primary cosmic particles, mostly decay into muons immediately, reflecting the details of the hadronic interactions depending on their energy. Measurement of the charge ratio of cosmic-ray muons can be used to constrain high-energy hadronic interaction models in the atmosphere. In this poster presentation, we will report the current status of the measurement of the charge ratio using data collected by the Super-Kamiokande (SK) detector. Using data observed in the 4th phase of SK (about 10 years), the charge ratio is measured to be 1.42 ± 0.02 (statistical uncertainty only), at the energy of 1.3 TeV. This value of the charge ratio is in good agreement with the result of previous deep underground experiments measured.
