Triggers, Efficiencies and Scale Factors

This report presents the work done on the trigger efficiencies and find- ing the scale factor in the CMS experiment at CERN from July 3 to August 25, 2023. The trigger system is responsible for selecting the most interesting events from the trillions of collisions that occur every second at the LHC. The trigger efficiencies are the probability that an event that passes the trigger selection criteria is actually a signal event. The scale factor is a correction factor that is applied to the trigger efficiencies to account for the fact that not all signal events are selected by the trig- ger.The research was dependent on the CMS framework to run the data coming from the LHC through jets and graph them using ROOT fitting and Monte-Carlo methods to get the graphs of the variation of the ef- ficiency as a function of the momentum.Finding the scale factor is very helpful and essential in the performance of the triggers by covering more and more desired data through correcting the efficiency.