Difference between revisions of "FSRoot"
From GlueXWiki
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| − | + | 2. Use FSRoot (available at [https://github.com/remitche66/FSRoot https://github.com/remitche66/FSRoot]) to make histograms from the flat trees. | |
| + | * See [https://github.com/remitche66/FSRoot/blob/master/Documentation/FSRoot.pdf FSRoot/Documentation/FSRoot.pdf] for documentation. | ||
== Here is a working example: == | == Here is a working example: == | ||
Revision as of 12:04, 10 December 2021
FSRoot is an alternative to DSelectors that uses flat trees.
There are two steps:
1. Use FlattenForFSRoot (hd_utilities/FlattenForFSRoot/flatten) to generate flat trees from the standard analysis trees.
> flatten -in [input file with analysis tree] -out [output file with flat tree]
- Run flatten with no flags to see further run options.
- This should work for data, reconstructed MC, and thrown MC.
- See the FlattenForFSRoot/Documentation directory for more information.
2. Use FSRoot (available at https://github.com/remitche66/FSRoot) to make histograms from the flat trees.
- See FSRoot/Documentation/FSRoot.pdf for documentation.
Here is a working example:
1. Flatten an analysis tree:
> flatten -in /u/home/remitche/FSRootExample/analysis.root -out flat.root
- where analysis.root was created by running /u/home/remitche/FSRootExample/MC.run
- which generates MC based on the config file /u/home/remitche/FSRootExample/MC.config
- which simulates the process gamma p --> eta' p --> eta pi+ pi- p --> (pi+ pi- pi0) pi+ pi- p using genr8 with the input file /u/home/remitche/FSRootExample/MC.genr8
2. Make a plot of the eta' mass:
root> FSHistogram::getTH1F("flat.root","ntFSGlueX_100_221","MASS(2,3,4,5,6)","(80,0.8,1.2)","")->Draw()
- where particles 2-6 are the five pions from the eta' decay
