Energy Calibration w/?0
Energy Correction
- Measured by PHENIX clustering algorithm
- PHENIX clustering algorithm is energy sum of a few core towers by considering shower profile. It’s to suppress overlapping effect
- Average energy obtained by PHENIX clustering algorithm is 93% of total shower.
- Energy correction of MIP into 280MeV
- Correction is made for every 144 towers.
- Path length by geometrical effect is already accounted.
?0 peak
(Asymmetryɘ.8 , Ptɮ.5GeV , TOF cutɚ?)
- Before correction
- 123.5? 1.9MeV
- After correction
Absolute energy scale is roughly correct in 2%
Invariant Mass after correction
Invariant Mass before correction