Hello, I am trying to merge a large number of root files that are in the NanoAOD format. In each root file, there are 5 TTree and each TTree has several branches. When I am trying to merge them with “hadd” command, I am getting a large number of errors. And also only the first TTree is getting merg…

This script is in the nanoAOD-tools repository, I don’t think you even need to source the standalone environment. It might also be in CMSSW as well. Syntax is basically the same as hadd, as seen in the first few lines of the code cms-nanoAOD/nanoAOD-tools/blob/master/scripts/haddnano.py #!/…

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