The content of ntuples produced by the Delphes fast simulation program is described in https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook/RootTreeDescription.
Sample analysis programs are available on titan in directory /home/willocq/Snowmass2013/root, see the files myExample1.C and myExample2.C. The first is a rather simple example of analysis code to produce some simple histograms. The second example uses a more complex program structure as well as Delphes analysis classes like a histogram manager.
Root files for analysis are located in /scratch/willocq/Snowmass2013/Delphes-3.0.9.