Delphes tree analyzer

This repository contains analysis codes that make histograms from Delphes trees. The template is made from a tree generated with Delphes-3.5.0. Contact me if the code fails to run with different version of Delphes. The codes are structured as follows.

.
├── BookHistograms.h   -> Declaration of histograms with x-range and binning.
├── Functions.h        -> Additional functions.
├── ana.C              -> Driver script handling inputs and outputs.
├── delAna.C           -> Main analysis script that needs to be compiled.
├── delAna.h           -> Header containing the analyzer class.
├── inputs             -> Directory containing the input Delphes trees.
├── outputs            -> Output directory where histograms and text files are generated.
└── Overlay/overlay.C  -> Reads from the hst files from outputs and makes histograms.

Making histograms

• Open the ROOT prompt and load the additional Delphes libraries.

gInterpreter->AddIncludePath("path to delphes base directory");
gInterpreter->AddIncludePath("delphes base directory/external");
gSystem->Load("delphes base directory/libDelphes.so");

• Compile the main analysis codes. This produces and loads the compiled library.

.L delAna.C+

• Run the driver script on the compiled library.

.x ana.C(0)

Making overlays

After the hst_<process name>.root files are generated by the analysis code, an overlay of some plot inside these files can be made as follows.

• Go to the directory Overlay/
• Put the name of the input files and required the plot in overlay.C
• Run the following inside the ROOT prompt.

.x overlay.C