This page is documentary purpose.

 Motivation:

FTPC global and primary tracks give different associate particle charge dependence for d+Au ridge study. See drupal.star.bnl.gov/STAR/blog/yili/dau-ridge-charge-identification-ftpc-global-tracks-instead-primary-tracks
 for global FTPC and primary TPC tracks.
See drupal.star.bnl.gov/STAR/blog/yili/dau-ridge-charge-identification-ftpc-eta-dependence for primary TPC and primary FTPC tracks.

Would the TPC global track give different result?
 

Method:

Dihadron correlation

Both the trigger and associate particles in TPC, global track .The dihadron correlation below shown is ZYAM substracted. 

1. The positive vs negative charge associate particle. 
2. Unlike vs like-sign

Data set:

Run3

|Vz| < 50 cm
global track in TPC
nHitsFit > 25 points for TPC
nHitsFit/nHitsPoss >= 51%
globa dca < 3 cm
|eta|<1 for TPC

Results:

1<pT<3 GeV/c

1. Associate particle charge

The left plot uses the global tracks. The right plot uses the primary tracks.

They are consistent with each other. 

2. Unlike vs like-sign

The left plot uses the global tracks. The right plot uses the primary tracks.

From global track, there is no unlike and like difference. 

For reference, smaller eta, global track:

Conclusion:

Global tracks and primary tracks have no difference for TPC-TPC correlations on the associate charge. 

Global tracks have no unlike, like difference. While primary tracks have.