This compares the effiiciency of the current PPV vertex finder (revision 1.29 which includes PCT fix) to the suggested change of including tracks with 0.1 GeV < pT < 0.2 GeV to the algorithim.  Currently PPV only uses tracks with pT > 0.2 GeV.  Since tracks with 0.1 GeV will not reach the BEMC and would be rejected with the PPV algorithim, we've included only tracks with 0.1 < pT <0.2 which cross the central membrane and we did not require them to point to a tower.

The bfc code is at:

/star/data05/scratch/rjreed/PPV2008Eval/Vertex5/
 

The daq files processed as of 9/7/2008 are at:

/star/data05/scratch/rjreed/PPV2008Eval/MuDstPt100/

Table 1:  Efficiency comparison between PPV revision 1.29 and altered PPV which accepts lower pT tracks.  Matching with the vpd is defined as the rank 0 PPV vertex is with 20 cm of the vpd vertex, and matching with the bbc is defined as the rank 0 PPV vertex is within 60 cm of the bbc vertex.

Table 2: Break down of the number of events used to calculate the efficiencies of the altered PPV vertex algorithim.

Table 3: PPV revision 1.29 statistics posted here for ease of comparison