Data samples :
- qqgamma : Pythia
- 4-fermions : Excalibur
- gamma-gamma : Twogam "unbiased" at 184 GeV
- Track selection :
- Skelana (Chris Parkes)
- Preselection :
- at least 6 charged particles
- transverse energy greater than 5
- at least 1 particle (charged or neutral) with Pt > 1.2
- |cos(theta)| of the missing momentum less than 0.88
- |cos(theta)| of the most energetic jet less than 0.95
- Econe30/visible energy
- < 0.7 at 189 GeV
- < 0.2 at 183 GeV
- Cuts :
- Step 1 : transverse energy greater than 15
- Step 2 : sqrt(sprime)
- < 180. at 189 GeV
- < 170. at 183 GeV
- Step 3 : Hermiticity Veto
- Monte-Carlo agreement with data :
- At 183 GeV :
| Step |
Data |
MC |
| 1 |
1998 |
1944 +/- 8 |
| 2 |
917 |
836 +/- 6 |
| 3 |
749 |
708 +/- 6 |
- At 189 GeV :
| Step |
Data |
MC |
| 1 |
7525 |
7421 +/- 29 |
| 2 |
4169 |
4138 +/- 26 |
| 3 |
3463 |
3487 +/- 21 |