The Ntuples files are available on CASTOR storage. The can be found in the directory

/castor/cern.ch/user/d/dmaitre/BlackHatSerpaNtuples/PROCESS/ENERGY/

where there is a subdirector per part. One can have a list of the parts using (for example)

rfdir /castor/cern.ch/user/d/dmaitre/BlackHatSherpaNtuples/Wm2j/7TeV/

and one would get

born
loop
real
vsub