Opendata root files

General Chat
1

Hi,

I have been working on ROOT since past 4 months. I have seen various .root files and analyzed them. Recently I downloaded one .root file from opendata.cern.ch but couldn’t understand the information given in that file.

http://opendata.cern.ch/record/14
This is the url of page from which I downloaded the file named :
0048DD36-6570-E011-A43C-485B39800BA2.root

Please let me know if there is any way of decoding the information given in the file.

Thank you.

2

It contains TTrees. If you do not know what they mean you should ask the author of these TTrees.

3

To be more concrete:

you can do:

 root 0048DD36-6570-E011-A43C-485B39800BA2.root

then:

root [5] .ls
TFile**		0048DD36-6570-E011-A43C-485B39800BA2.root	
 TFile*		0048DD36-6570-E011-A43C-485B39800BA2.root	
  OBJ: TTree	Events	 : 0 at: 0x7fbb6b6a57b0
  KEY: TTree	MetaData;1	
  KEY: TTree	ParameterSets;1	
  KEY: TTree	Parentage;1	
  KEY: TTree	Events;1	
  KEY: TTree	LuminosityBlocks;1	
  KEY: TTree	Runs;1	
root [6]

Then:

 Events->Print();
4

Hi,

I have tried your command but could not understand what it printed. I’ll try contacting author. Thank you.

5

The MetaData tree should be helpful to understand the data.
The OpenData web site also has some description of the data.

6

root.cern.ch/root/html604/TREE_TREE_Index.html