d+Au ridge: Charge Identification -- MC after GEANT Global vs Primary Tracks Charge & Pt & Phi in FTPC, TPC
This page is documentary purpose.
Motivation:
For the comparison with real data drupal.star.bnl.gov/STAR/blog/yili/dau-ridge-charge-identification-global-vs-primary-tracks-charge-p-ftpc-tpc
Method:
MC after GEANT from STAR simulation production.
Global and primary track Pt,Charge, φ and η relationship within the same track for TPC, FTPC-Au, FTPC-d.
Data set:
Run3 MC data.
|Vz| < 50 cm
nHitsFit > 25 points for TPC, 5 points for FTPC
nHitsFit/nHitsPoss >= 51%
globa dca < 3 cm
|eta|<1 for TPC, 2.8<|eta|<3.8 for FTPC
Results:
1. Pt
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Similar to real data.
2. Charge
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1/5 FTPC change sign for MC, compared with half for real data.
3. φ
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For those tracks change sign from Positive for global tracks to Negative for primary tracks:
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For those tracks change sign from Negative for global tracks to Positive for primary tracks:
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None TPC tracks have charge sign change.
For FTPC, those change sign from pos. to neg. ,and neg. to pos. have opposite global φ - primary φ. While in real data, they have both negative and positive global φ - primary φ for both cases.
4. η
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