Skimming

Ntuple skimming is very easy to do in NAIA. You can setup a new file for your skimmed ntuples by calling NAIAChain::CreateSkimTree and specifying the name of the output root file (see doxygen).

CreateSkimTree will return a SkimTreeHandle object. As the name implies the SkimTreeHandle is a handle to the new tree, you can call Fill on it to save a given event in the new tree.

When you’re done processing you can call Write on the SkimTreeHandle to write the resulting TTree on the output root file.

Note

If you don’t want to write out some containers (in case you know you won’t need them and want to save some space) you can pass a semicolon-separated list of containers to exclude as the second argument of CreateSkimHandle.