Introduction to Object Analysis

Last update: 14 Nov 2022 [History] [Edit]

This section of the tutorial goes through the process of adding and analyzing various objects that we detect with ATLAS. We will go through three of the big ones: electrons, muons, and jets (+ discussions on missing transverse energy).

Particle Representations in ATLAS Detector

A required step when we analyze our objects is to perform calibration and selections. Each CP group defines their own tools and functions to assist us with this process. We are going to take a look at some typical ways we apply the hard work of the CP groups to our analysis.

The general formula for adding object information to our ntuples is similar to what we did for the events:

  • Define branches
  • Retrieve container
  • Apply calibration and selection criteria
  • Perform calculations
  • Write to the tree