[Recorded on 05.30.2019] Following up from

https://drupal.star.bnl.gov/STAR/blog/dmawxc/update-05232019-run-9-embedding-track-matching-quantities-different-ranges-ptmc

We're trying to figure out a mysterious dip in the reconstructed pTtrk distribution. It might have to do with how we match detector-level tracks to particle-level tracks, so we've been checking quantities that play into that process (see the above link). Here are the the nCommon (the no. of TPC hits for a given detector-level track which is common to a given particle-level track) and pTfrac (= pTmatch / pTmc) distributions for all pTmc and for pTmc > 8 GeV/c:

Hmmm... While the pTfrac ratio is not flat, but it's not really all that illuminating...