Code is at:

/star/u/rjreed/PPV2009/Eval500GeV02/

compiled in stardev

 

Code was run over 670080 low luminosity events.    All events were trigger 4 (BBCMB).

There were only 1177 events with no vertices.  (0.18%)

There were 249454 events with no postive ranked vertices. (37.2%)

 

There were only 14 events where the primary vertex had a rank > 0, but rank <1e6

There were no events where a vertex with a lower order had a higher rank than the primary vertex.

 

For some reason, I couldn't get any vpd Vz.  I will look to see if there is another method.   I used:

  StMuDst* mMuDst = muDstMaker->muDst();
  StMuEvent* mEvent = mMuDst->event();
  float vpdVz = mEvent->vpdVz();
 

I also did not get any events with tracks crossing the TPC CM, which doesn't make sense.  I used the command:

mMuDst->primaryVertex()->nCrossCentralMembrane();

I suspect there is another way to access this information

There were 18083 events with a bbc vertex.  (2.7%)

 

Figure 1: # of vertices per event, all vertices

Figure 2: Primary vertex z position for all vertices

Figure 3: Vertex z for all vertices, regardless of rank

 

Figure 4: Vertex z position from BBC.  I do not know why it is so off center.  It seems especially odd given the symmetry of the found vertices.

Figure 5:  The black curve is the primary vertex z position minus the bbc z position. The blue curve is the same thing with the added condition that the primary vertex have a positive rank.

 

Figure 6:  The black curve is the same as in Figure 5, but the red curve is Vz - bbc vz where Vz is the z location of the closest vertex within the first 6 listed vertices.

Figure 7:  Rank of the primary vertex where the following statement was used:

if rank > 1e6

fill(log(rank - 1e6) +10)

if 1e6>rank>0

fill(log(rank))

if rank<0

fill(log(rank+1e6)-10)

 

Figure 8:  Same quantity as in Figure 7, but this time for the first 6 vertices.

Figure 8: # of tracks matched to the BEMC for the primary vertex

 

Figure 9: # of tracks matched to the BEMC for the first 6 vertices

Figure 10: # of tracks used in the primary vertex

Figure 11: # of tracks used to form the first 6 vertices

 

Figure 12: Refmult for the first 6 vertices

 

 

 

More graphs to come......