Vertex positions for gamma--< e+e- conversions

  1. Input: Pythia, partonic pT > 7 GeV data sample + full GSTAR simulation
  2. Select all MC tracks which are photons and have a "stop" vertex (i.e. they convert)
  3. Plot R vs Z and X vs Y of every conversion.

Figure 1 -- R vs Z (left), X vs Y (right)

Figure 2 -- R vs Z (left), X vs Y (right), zoomed in on SVT