12/12/01 Franco Ligabue

(WWqqqq) with Common N-tuples

v1.3 first look

12/12/01 Franco Ligabue

• Tried 4fcc03 weights: high cc03 cross-section obtained• used cc03 files

• bkg: Kqq files + KZZ (or PZZ when KZZ not available)

• first look: 1999 results look strange – bug? (NN training choice may be messy)– stat. Errors OK (at least!)

• 2000 results look OK– a bit lower than before:

• MC 4f X-section higher• MC cc3 X-section lower

12/12/01 Franco Ligabue

At 207 GeV:

higher 4f X-section

12/12/01 Franco Ligabue

for 1999:

Different signal shape

check NN training actually used

12/12/01 Franco Ligabue

207 GeV

newold

12/12/01 Franco Ligabue

Old MCv1.2

7.35±0.42

6.83±0.23

8.60±0.61

7.42±0.35

7.30±0.33

6.94±0.48

7.67±0.35

7.72±0.27

New MC4f weights

7.95±0.43

7.23±0.23

8.96±0.64

7.49±0.36

7.95±0.35

7.45±0.49

7.78±0.36

7.68±0.28

Old MCv1.3

7.52±0.41

6.87±0.23

New MCcc03 files

7.36±0.41

7.73±0.23

8.52±0.61

7.10±0.35

7.55±0.33

7.12±0.48

7.49±0.35

7.39±0.27

Old MCv1.2

183

189

192

196

200

202

205

207

First results compared to old ones

ZZ MC

KZZ

KZZ

KZZ

PZZ

KZZ

KZZ

PZZ

PZZ

12/12/01 Franco Ligabue

Old MC

16.01

16.92

17.59

17.81

17.89

17.97

18.00

New MC

17.01

18.10

18.43

18.80

19.05

19.14

19.26

19.28

Old MCv1.2

183

189

192

196

200

202

205

207

4f (pb)

Old MC

15.73

16.56

17.19

17.38

17.47

17.51

17.53

New MC

15.60

16.58

16.84

17.15

17.32

17.41

17.49

17.51

cc03 (pb)

New MCcc3

weights

16.52

17.34

17.82

12/12/01 Franco Ligabue

Still (a lot) to do:

• Recheck everything, especially 1999• wait for right 4f X-sections/weights• 1st bin saga :

– 1) take it out for good– 2) try removing events with zero-mass jets?

• Rediscuss systematic procedures, especially for qq bkg (and apply them)

• …work…• USE PYTHIA ZZ!! (after Brigitte’s comment)