Comparison of methods for FMS-FPS correlaation
- Methods:
a. Simple division only (= normal corr/event mixed corr) -> suffix "div"
b. Division after self normalize each of them (= normal corr after self norm / event mixed corr afer self norm) -> suffix "norm"
- Self nomalization: for a correlation TH2 (FPS slat vs. FMS points position projected),
1. Get X projection: then each bin corresponds to sum of all FPS slats along the position.
2. Normalize 'entire slats contributed to the sum' by sum itself.
-> By doing this signal (stands out correlation) also will be a little scaled down,
but fluctuating backgrounds in other slats will be effectively suppressed.
-> Also peak position itself cannot be changed (?)
-> Then two factors are dealt with simultaneously
1) Concentration of FMS points in certain position (FMS cell's efficiency)
2) FPS slats' efficiency (= effectiveness/accuracy of FPS Mip)
- I expect method a. and b. will give similar peak position if both FMS and FPS are well calibrated
-> Therefore checked a few RUN15 runs: it seems both results are not very different compared to RUN17 runs
* this could be intrinsic difference between RUN15 (200 GeV) and RUN17 (510 GeV)
- Concern about division method: I cannot see FMS-FPost hadron correlation not at all by division
- ckimstar's blog
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