I have a root file with two trees:
a) UnCleaned (the branches are EventNumber, mass and direction)
b) Cleaned (branches are EventNumber, direction)
Now, ‘Cleaned’ is strictly a subset of ‘Uncleaned’. My question is how do I histogram all the Cleaned.direction events with a cut like Uncleaned.mass <5).
I would greatly appreciate any help.
PS the above scenario is purposefully simplified. I want to learn how to work with multiple trees at the same time!