The ATLASWatchMan D3PD Model

Introduction

The ATLASWatchMan package dynamically generates the Analysis Code. Running this generated code (locally or on the Grid) produces as output a D3PD file, the ATLAS name for a plain ROOT file, containing only ROOT TTree and/or histograms.

As you might have seen in previous pages, ATLASWatchMan is an automated Analysis Code Generator, that accepts as inputs a file defining as many channels/analyses as the user wants (the so called Steering File) and it returns a plain, clear analysis code, written in Python, and ready to be run.

Once the generated analsyis code is run, locally or on the Grid, the output is a D3PD file, containing one single ROOT TTree.

This TTree contains all the outputs from all the analyses the user defines in the Steering File.

Information is stored in a clever way, to store all the quantities needed, but saving as much space as possible. This in order to have a lightweight D3PD .

This intent is reached setting flags to events, particles and other quantities stored in the TTree; from those flags the user can know, and he/she can select, those events belonging to a specific channel/analysis, and those particles/quantities passing a specific object selection or overlap removal cut.

Content of the ATLASWatchMan D3PD

...more info coming soon...

If you open the ATLASWatchMan D3PD with the ROOT TBrowser (see note (2) here)

Fig. 1 An example of a minimal ATLASWatchMan D3PD content: "meff" and "SphCSC" are user-defined quantities.
ATLASWatchMan_D3PDTBrowser.jpg

Fig. 2 How ATLASWatchMan give a flag to events having passed all the cuts of one analysis/channel
ATLASWatchMan_EventsFlags

Fig. 3 How ATLASWatchMan give a flag to objects having passed all the object selection and overlap removal cuts that the user defined in a specific analysis/channel.
ATLASWatchMan_ObjectsFlags_[640x480].jpg

How to read your ATLASWatchMan D3PD, the output of your analsys!

...more info coming soon...


-- RiccardoMariaBianchi - 28 Jan 2009

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Topic revision: r9 - 2009-07-27 - RiccardoMariaBianchi
 
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