Efficiency Studies using the Tag and Probe Method

What is this lesson about?

Welcome. In this lesson you will:

  • Learn what Tag & Probe method is.
  • Plotting efficiency distributions for several variables using the Tag & Probe Method with data from ϒ (Upsilon) resonance decays to dimuons.
  • Learn two methods for performing signal extraction from a given dataset.
  • Learn how to use two efficiency measurement tools.

Prerequisites

In order to complete this lesson you need

  • ROOT CERN 6.16 or later installed. You can set up ROOT as recommended here.
  • Internet connection.
  • A basic understanding of terminal commands.

Helpline

Authors: Allan Jales (Rio de Janeiro State University - UERJ/Brazil) and Thomas Gaehtgens (Instituto Superior Técnico - IST/Lisbon)

Advisors: Eliza Melo (UERJ/Brazil), Nuno Leonardo (LIP/Lisbon) and Sandro Fonseca (UERJ/Brazil)

Data used

The data used in this lesson was derived (already pre-processed with tools similar to the ones you have been learning about) from these CMS Open Data datasets:

Schedule

Setup Download files required for the lesson
00:00 1. Introduction How do we calculate efficiencies for the identification of physics objects?
What is the tag and probe method for calculating efficiencies?
00:10 2. The Fitting Method What is the fitting method?
How do we use it to calculate the efficiency we are interested in (identification of tracker muons)?
00:40 3. Sideband subtraction method What is the sideband subtraction method?
How to implement it?
01:20 4. Results comparison How good are the results?
01:45 Finish

The actual schedule may vary slightly depending on the topics and exercises chosen by the instructor.