The plots above are to show the first cut performed on the data.  DeltaPhi of the Jets is defined as the absolute value of the difference between the phi of the two jets. ( DeltaPhi = | phi1-phi2 | ). We required that DeltaPhi must be greater than 150 degrees, which is the cut on the data and ensures that the jets are back to back. Also, for symmetry purposes I required that DeltaPhi be less than 210 degrees. The x-axis in the plots above are in radians. The first plot above is before any cut and the plot below is after cut. 

So the second cut performed is removing the events where the components of the vertex are zero. Also, I inserted another cut that required the z-component of the vertex to be less than 30 and greater than -30. The first plot is before and second plot is after the cut is performed. 

So the above two plots show the cut in detEta. We required that |detEta| >= 0.5. Note: This is the detector eta for Jet 1.

Once again the above two plots show the cut in Detector Eta. However, this is for the second Jet and the cut is again |DetEta| >= 0.5.

Now for the weird stuff: 

In the following figure I am showing the before and after the vertex cuts were performed for the x-component of the vertex. 

And now for the Y component

As you can see, again zero is the only thing being filled for the x and y components for the events. However, increased the bin to 5000 and went from minus 5 to 5. However when I used TBrowser to look at the plot it did show that zero was not the only value being filled so I think the code is fine but I probably need to change my domain and binning. :)