2010.02.08 StEemcGammaFilterMaker QA: QCD vs. gamma-jet ccept/reject rates
StEemcGammaFilterMaker QA
Pythia generated processes
| Pythia gamma-jet |
Pythia QCD 2->2 processes |
| 14 f + fbar -> g + gamma |
11 f + f' -> f + f' (QCD) |
| 18 f + fbar -> gamma + gamma |
12 f + fbar -> f' + fbar' |
| 29 f + g -> f + gamma |
13 f + fbar -> g + g |
| 114 g + g -> gamma + gamma |
28 f + g -> f + g |
| 115 g + g -> g + gamma |
53 g + g -> f + fbar |
| |
68 g + g -> g + g |
Number of generated events per parton pt bin
| |
Number of generated events
(100events/job) |
| Parton pt range (GeV) |
2-3 |
3-4 |
4-6 |
6-9 |
9-15 |
15-25 |
| Pythia gamma-jet |
50K |
50K |
50K |
50K |
50K |
50K |
| Pythia QCD 2->2 processes |
100K |
100K |
50K |
50K |
50K |
50K |
Filter configuration
| Filter parameter |
Value |
Notes |
| mConeRadius |
0.24 |
|
| mSeedThreshold |
2.5 |
Cluster seed energy threshold |
| mClusterThreshold |
3.7 |
Cluster Et threshold |
| mEtaLow |
0.9 |
EEMC acceptance |
| mEtaHigh |
2.1 |
EEMC acceptance |
| mSmearEnergy |
0 |
Disabled |
| mThrowTracks |
0 |
Disabled |
| mCalDepth |
279.5 |
ZDC SMD depth |
| mMinPartEnergy |
1e-05 |
Disabled by mThrowTracks=0 |
| mHadronScale |
0.4 |
Downscale factor for hadron energy |
| mFilterMode |
0 |
Accepting all events |
stasim/Pythia options
- detp geometry y2006h
- Calorimeter cut for electromagnetic processes: emc_10keV
- call pytune(100): PYTUNE v1.015; CDF Tune A
Figures
Figure 1: Pythia Eemc gamma filter QA:
(left) False rejection, (right) fraction of accepted events
Comments
- Overall false rejection is < 0.02% (10^-4)
for both QCD and gamma-jet simulations.
- In parton pt range 6-15 GeV the acceptance rate
for the gamma-jet MC is ~ 50%
(I think this is due to rapidity fiducial cut,
otherwise it should be closer to 100%).
For the QCD sample (in the same pt region)
acceptance rate is 8-25%.
- Somehow for highest parton pt filter acceptance is the
same for gamma-jet and QCD Monte-Carlo.