Start up tutorial for using CERN data for simulation

Dear Developers!
I have used DEM codes and others simulation codes for running simulations for condensed matter physics. Now I am very interested in neutrino physics (neutrino flavor oscillation etc). I want to run the simulations using ROOT. Please any one guide me from where to start as I am totally new to TOOL (I know C and C++) and also new to neutrino physics data? How to get data from CERN and other labs and use in TOOL? Please any tutorial/guide/ebook in this connection.
Thank you very much!
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