Previously, I had calculated a tracking resolution with a width of 0.1% added in quadrature with a constant width of 3%.  I was anticipating a tracking resolution with a width of ~1% added in quadrature with a constant width of 5%, so I tried applying both to Pythia8 and comparing the resulting track pT distributions to data:

While the 5%+1% distribution fits slightly better, there's no significant difference... Here are the two Pythia8 distributions on top of each other:

In both cases, a tracking efficiency as calculated previously (see the link below) was applied to the tracks in Pythia.

https://drupal.star.bnl.gov/STAR/blog/dmawxc/update-04112018-run-9-pp-efficiency-different-binning-0

And the resolution calculation can be found here:

https://drupal.star.bnl.gov/STAR/blog/dmawxc/update-04162018-run-9-pp-pt-resolution-width