This note summarizes the methods developed to characterize the cosmic ray muon measurements made in Building 912 for the inner and outer HCal. The cuts used to develop a clear minimum ionizing peak are described, along with the methods for reliable extract the peak values of the ADC distribution. The results of applying the Performance Ratio and temperature corrections are also described. 

This note focuses on the progress of the HCal calibration using cosmic muons. The energy deposited by muons passing through the sectors is recorded and selected to get the events where the muons pass through all tiles in a tower. Our primary diagnostic is the Most Probable Value (MPV) of the ADC distributions for such events. The MPV's are corrected with the temperatures and the Performance Ratio (PR) of the tiles in each tower. And they will determine the gain of each tower.

This note describes the GEANT4 study with a cosmic muon generator with a realistic zenith angle and energy distribution to investigate the possibility of using cosmic muon events as a calibration source for the hadronic calorimeters (HCal's) when the full sPHENIX apparatus is in its data-taking position.