1. l Event selection l Method l Combination l Summary and conclusion Color reconnection analysis for the summer conference 2001 in Budapest Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 20011

2. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 20012 Event selections L3 like selection (very restrictive) More global selection (effectively W mass selection) cut on neural net output at 0.3

3. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 20013 particle flow method use projection into 4 planes for both selections! particle flow (using all charged/neutral objects) charged particle flow (using charged tracks only) energy flow (using all charged/neutral objects) charged energy flow (using charged tracks only)

4. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 20014

5. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 20015

6. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 20016 rescaling of angles:

7. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 20017 rescaling of angles:

8. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 20018 Charged particle flow L3 selection NN selection

9. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 20019 energy flow L3 selection NN selection

10. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 200110 normal particle flow L3 selectionNN selection

11. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 200111 The Rathsman model

12. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 200112

13. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 200113

14. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 200114 Combination of results 2 2 L3 selection particle flow NN selection particle flow R n 2.6 1 -limit 6-7 R n 3.5 1 -limit 12-13 KiKi KiKi

15. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 200115 Some numbers L3 selS(R n ) R n 1 limit pflow4.22.66.8 eflow2.91.67.6 ch. pflow3.58.0 80.0 ch. eflow2.21.59.2 NN sel pflow5.03.5 12.0 eflow3.63.5 50.0 ch. pflow4.67.0 80.0 ch. eflow2.82.3 15.0

16. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 200116 Systematics l already included: - difference JETSET – HERWIG - difference BE reference – BE inside W only - MC statistics l Still to be done - vary BKG by +/- 1

17. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 200117 LEP combination l want to perform it for 189 GeV before summer conference! l DLO have L3 selection, pflow in 4 planes, with charged tracks only l considered systematics: as shown before, but without difference JETSET-HERWIG

18. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 200118 What still has to be done l Produce all R n values for all models (at 189 GeV) ( Rathsman, Ar, Ar2, SKII, Hw, Hw cr) (just have to make the list) l Calculate 2 for all models (at 189 GeV) l Systematics: vary BKG by +/- 1 uncertainty

19. Thomas Ziegler, Johannes Gutenberg Universität, MainzW meeting 13. Juni 200119 What to show for the conference l Use normal particle flow with W-mass selection in 4 planes (as it has highest sensitivity) l L3 selection in 4 planes can/should be shown as well as comparison to DLO results