NtupleTutorial: Difference between revisions
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==Introduction== | ==Introduction== | ||
When you want to perform a physics analysis, you need a way to access and manipulate the data. For Mu2e, this could include evaluating the performance of the tracking chamber or calorimeter or cosmic ray veto detector. You might want to look at "raw" information from the detector, like voltages or waveforms, or you might want higher-level quantities, where hits from the tracking detector have been combined into tracks or energy deposits in the calorimeter have been clustered into total particle energy. Whatever you need to do, you need a way to organize the information that you need. | |||
At its most basic, you can think of an ntuple as a database. It has a variables defined that are filled with information. There are many different formats your ntuple can take, depending on what information you want to access. In this tutorial we will work with a basic tracking ntuple. We will learn how to discover what information the ntuple contains and how to access and display that information. Hopefully what you learn here will translate to other ntuples that you face in the future. | |||
Note that much of the work we'll do is related to learning how to work with [root][https://root.cern.ch/], a common plotting/fitting program used across many experiments in particle physics. There are many root tutorials out there that you might find useful before, during, or after going through this tutorial. | |||
==Become Familiar with the nutple== | ==Become Familiar with the nutple== | ||
Revision as of 21:17, 27 June 2018
Introduction
When you want to perform a physics analysis, you need a way to access and manipulate the data. For Mu2e, this could include evaluating the performance of the tracking chamber or calorimeter or cosmic ray veto detector. You might want to look at "raw" information from the detector, like voltages or waveforms, or you might want higher-level quantities, where hits from the tracking detector have been combined into tracks or energy deposits in the calorimeter have been clustered into total particle energy. Whatever you need to do, you need a way to organize the information that you need.
At its most basic, you can think of an ntuple as a database. It has a variables defined that are filled with information. There are many different formats your ntuple can take, depending on what information you want to access. In this tutorial we will work with a basic tracking ntuple. We will learn how to discover what information the ntuple contains and how to access and display that information. Hopefully what you learn here will translate to other ntuples that you face in the future.
Note that much of the work we'll do is related to learning how to work with [root][1], a common plotting/fitting program used across many experiments in particle physics. There are many root tutorials out there that you might find useful before, during, or after going through this tutorial.