Leaf variable meaning and its unit

Newbie
1

Dear ROOT experts,

I am not sure here is the right place to post this question?

I have one root file with one tree inside, and in this tree, there are many leaf variables, such as px, py, pz, E, etc. For some leaf variables, I can guess their meanings and their units (SI unit); however, there are some leaf variables that I cannot guess anything.

So, is there a way to explore the meaning of the leaf variable and its unit in the root file? (I mean any root files.)

Thanks in advance.

2

The meanings of leaves and their units are “defined” by the author(s) of these files. ROOT does not provide any default / standard method to store / retrieve this information in / from such files.

3

Hi!, @Wile_E_Coyote,

Thank you so much for your answer.

So, it seems that I need to ask the creator of this root file.
And there are no any commands inside root software to explore the meaning of the leaf variable and its unit. I am not sure that my understanding is correct or not?

Thanks, again.

4

The one who gave you these files should also provide you with a “precise description” of their contents.

5

Hi!, @Wile_E_Coyote,

Okay, I get it now.

Thanks a lot.