sPHENIX tracking discussion

[Michael Joseph Peters <mjpeters AT mit.edu>]

Hi all,

Finally changed over to logarithmic binning, and ran all-new reco jobs for both a current-build CA seeding reference and a TPC-truth-seeding reference within the last few hours. Here is the resulting efficiency comparison:

There are two strange things I see here:

1) The drop at low pT occurs even with truth TPC seeding; and

2) CA seeding appears to somehow outperform truth TPC seeding at high pT.

Are either of these things understood? 

For details, the black points were produced with the default G4_Tracking.C and the red were produced using use_truth_tpc_seeding = true and use_truth_vertexing = true. (The truth vertexing was a holdover from an earlier test that I forgot to change; I don't think it would affect the efficiency much at all, but I'll run jobs tomorrow to verify.) Reco tracks were selected using nhits>40&&quality<10&&nmaps>0.

Thanks,

Michael Peters