Estudo dos algoritmos de classificação de elétrons no experimento atlas

Abstract

The Standard Model collects everything that is currently known about the most fundamental elements of matter and their interactions. The Standard Model accurately describes the phenomena within its domain, but it is still incomplete. So, new information from experiments in the Large Hadron Collider (LHC) and the ATLAS (A Toroidal LHC Apparatus) detector will help quest for new particles. The process of protons collisions generate decays with lepton final state, which is used in several physical researches, in particular the Z’ particle and its decay in electron and positron. In this work several analyzes in order to verify the behavior of the HTL_Ringer and the e/γ Standard algorithms regarding efficiency rating of electrons/positrons and jets rejection by two parameters were made. The first one investigates the performance of these classifiers on classifying these particles in a wide range of momentum. The second parameter used for analysis was the η coordinate from ATLAS detector, aiming not only to verify the behavior of the data in relation to the detector hitting position, but mostly how the two algorithms behave to this coordinate and how this information can influence the classification of the particles of interest. The results show that the efficiency of classification can be affected by these two parameters.