The Hall Current in Collisionless Reconnection and Reconnection in an Electron-Positron Plasma
L Event selection l Method l Combination l Summary and conclusion Color reconnection analysis for...
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Transcript of L Event selection l Method l Combination l Summary and conclusion Color reconnection analysis for...
Event selection
Method
Combination
Summary and conclusion
Color reconnection analysisfor the summer conference
2001 in Budapest
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 1
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 2
Event selections
L3 like selection (very restrictive)
More global selection (effectively W mass selection)cut on neural net output at 0.3
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 3
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)
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 4
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 5
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 6
rescaling of angles:
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 7
rescaling of angles:
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 8
Charged particle flow
L3 selection NN selection
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 9
energy flow
L3 selection NN selection
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 10
normal particle flow
L3 selection NN selection
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 11
The Rathsman model
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 12
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 13
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 14
Combination of results
2 2
L3 selectionparticle flow
NN selectionparticle flow
Rn2.6 1-limit 6-7 Rn3.5 1-limit 12-13Ki Ki
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 15
Some numbers
L3 sel S(Rn) Rn 1 limit
pflow 4.2 2.6 6.8
eflow 2.9 1.6 7.6
ch. pflow 3.5 8.0 80.0
ch. eflow 2.2 1.5 9.2
NN sel
pflow 5.0 3.5 12.0
eflow 3.6 3.5 50.0
ch. pflow 4.6 7.0 80.0
ch. eflow 2.8 2.3 15.0
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 16
Systematics
already included:- difference JETSET – HERWIG- difference BE reference – BE inside W only- MC statistics
Still to be done- vary BKG by +/- 1
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 17
LEP combination
want to perform it for 189 GeV before summer conference!
DLO have L3 selection, pflow in 4 planes,with charged tracks only
considered systematics:as shown before, but without difference JETSET-HERWIG
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 18
What still has to be done
Produce all Rn values for all models (at 189 GeV)( Rathsman, Ar, Ar2, SKII, Hw, Hw cr)(just have to make the list)
Calculate 2 for all models (at 189 GeV)
Systematics: vary BKG by +/- 1 uncertainty
Thomas Ziegler, Johannes Gutenberg Universität, Mainz W meeting 13. Juni 2001 19
What to show for the conference
Use normal particle flow with W-mass selection in 4 planes (as it has highest sensitivity)
L3 selection in 4 planes can/should be shown as well as comparison to DLO results