HEPTutorial: CMS Data Analysis Exercises

Overview

This project is a High Energy Physics (HEP) analysis tutorial inspired by CMS data and Monte Carlo simulations. It offers a practical, hands-on approach to learning data analysis techniques commonly used in particle physics, leveraging the ROOT framework and C++.

This tutorial is based on the official CMS HEP Tutorial by IPPOG, which I am using for self-study and learning.

Purpose

The primary goal of this repository is to facilitate learning and knowledge sharing. By completing the exercises, you will:

• Understand the structure and workflow of HEP data analysis.
• Learn how to select and analyze physics objects such as muons, electrons, and jets.
• Practice creating, filling, and visualizing histograms.
• Compare experimental data with Monte Carlo simulations.
• Develop skills in modular C++ programming and the ROOT analysis framework.

This repository is designed for personal learning purposes and encourages experimentation and sharing of ideas.

Structure

• Each exercise is implemented in a separate Git branch.
  • This allows you to focus on one analysis task at a time and track your progress.
• The main files and their roles:
  • example.C: The main program. Sets up the analysis, processes data/MC files, and calls the plotter.
  • MyAnalysis.h / MyAnalysis.C: The core analysis logic. Handles event selection, object reconstruction, and histogram filling.
  • MyMuon.h, MyJet.h, etc.: Definitions for physics objects.
  • Plotter.h / Plotter.C: Handles plotting and visualization of histograms.
  • Makefile: Automates compilation.
  • files/: Contains input ROOT files (data and MC samples).
  • Output files (e.g., results.pdf): Plots generated by the analysis.

How to Use

1. Clone the repository and check out the branch for the exercise you want to work on:

   git checkout exercise1

2. Compile the code using the provided Makefile:

   make

3. Run the analysis:

   ./example.x

4. View the results in the generated PDF files (e.g., results.pdf).

Exercises

Each branch corresponds to a specific exercise, such as:

• Muon multiplicity and invariant mass analysis (exercise 1)
• Properties of top quark events (exercise 2)
• Cross-section of top quark production (exercise 3)
• Top quark mass reconstruction (exercise 4)

Follow the instructions in each branch to complete the exercise and learn the relevant analysis techniques.

Notes

• This project is for educational purposes only.
• The code is modular and can be extended for more advanced analyses.
• If you have questions or want to try your own ideas, feel free to experiment by creating new branches.

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Happy analyzing!