Final Results for 189 GeV (Last update 10/01/00 )

L=174.20 ± 0.20 ± 0.73 pb-1 (stat and syst errors are there)

 Classification

 Systematics

 Systematics(simplified)

 Branching ratios

 Vcs

 Plots


 

Classification

Event selection + classification
ee 
eµ 
e 
µµ 
µ 
  
qqe 
qqµ 
qq (excl)
qqqq 
CC03

Efficiencies

in % 
evev
57.8±0.89
0.00
8.8±0.51
0.00
0.00
0.46±0.12
 
 
 
 
evµv 
0.02±0.02
59.0±0.64
4.7±0.23
0.00
4.6±0.29
0.3±0.08
 
 
 
 
evv 
3.0±0.26
4.2±0.25
50.10±0.65
0.00
0.30±0.07
4.3±0.24
 
 
 
 
µvµv 
0.00
0.1±0.03
0.00
61.9±0.89
8.3±0.48
0.3±0.11
 
 
 
 
µvv 
0.02±0.02
4.2±0.27
0.3±0.06
3.5±0.26
52.9±0.65
3.5±0.21
 
 
 
 

vv

0.22±0.09
0.4±0.15
7.7±0.44
0.35±0.11
6.0±0.44
36.5±0.90
 
 
 
 
qqev 
 
 
 
 
 
 
82.4 
0.00 
5.4 
0.2 
qqµv 
 
 
 
 
 
 
0.00 
87.5 
4.1 
0.2 
qqv 
 
 
 
 
 
 
3.7 
3.8 
59.0 
0.9 
qqqq 
 
 
 
 
 
 
0.2
0.2
0.9
91.7
Background 

Cross 

sections

in fb
 
 
 
 
 
 
 
 
 
 
l+l-
 
 
 
 
 
 
 
 
 
 
qq 
 
 
 
 
 
 
 
 
 
 
ZZ 
 
 
 
 
 
 
 
 
 
 
Zee 
 
 
 
 
 
 
 
 
 
 
Wev 
 
 
 
 
 
 
 
 
 
 
Total bkgd
17.9±1.9
7.2±2.1
43.5±4.5
11.0±1.2
15.4±2.1
36.2±4.2
99 
26 
189 
1854
Data events

L=174.20 pb-1
Andrea/Dirk/Maria 
24 
51 
48 
26 
46 
25 
 
 
 
 
Garance 
26 
48 
51 
25 
51 
31 
 
 
 
 
Paolo/Dirk/Anne 
 
 
 
 
 
 
381 
382 
303 
 
Fabrice/Christophe 
 
 
 
 
 
 
 
 
 
 
Shan 
 
 
 
 
 
 
 
 
 
1435 
Franco 
 
 
 
 
 
 
 
 
 
 
X-Sections in pb
Andrea/Dirk/Maria 
0.190±0.049
0.43±0.068
0.36±0.080
0.20±0.048
0.38±0.08
0.22±0.08
 
 
 
 
Garance 
0.166±0.047
0.401±0.063
0.376±0.083
0.178±0.046
0.448±0.082
0.318±0.105
 
 
 
 
Paolo/Dirk/Anne 
 
 
 
 
 
 
2.41 ± .14 
2.39 ± .13 
2.23 ± .17 
 
Fabrice/Christophe 
 
 
 
 
 
 
 
 
 
6.81±0.23±0.13
Shan 
 
 
 
 
 
 
 
 
 
6.84±0.23±0.13
Franco 
 
 
 
 
 
 
 
 
 
6.80±0.26±0.14
Summary

SM in ()
1.78 ± 0.13 ± 0.02 (1.76) 
7.07±0.23±0.11 (7.29)
6.94±0.23±0.16 (7.59)
15.76 ± 0.34 ± 0.21 (16.65±0.33)

Remarks:

efficiencies and background take into account inefficiencies due to beam related background in the lvqq channel

numbers in parentheses are standard model predictions for Mw=80.39 GeV/c2 and Ecm=188.6 GeV, the leptonic BR is 10.83%, thus the hadronic Br is 45.58%

qqqq with NN19(QNNWTAG2.0). or with NN14(WW4Q_TAG).

qqqq column for a cut on NN14>0.3

qqqq final result corrected upward by 0.1pb due to bad jet "smearing"

Systematics on above results (in fb)

Event selection + classification

Source

evev

evµv

evv

µvµv

µvv

vv

lvlv

qqev

qqµv

qqv (excl)

qqlv

qqqq

HCAL calibration

10

ECAL calibration

30

jet corrections

9

QCD generator

23

Background normalization

13

10

8

38

30

84

Bhabha generator

4

Luminosity(0.42%)

9

11

10

11

35

39

mW

10

Colour reconnection

25

Bose-Einstein

29

WW generator

23

WW fragmentation

17

MC statistics

15

15?

10?

10?

61

36

photon veto

23?

1

2

50

30

E12 veto

10 ?

4f-CC03 correction

27 ?

33

32

35

54

8

lepton id

2

18

46

15

45

lepton isolation

42

17

3

56

probability discrimination

34

9

3

46

beam gas

11

30

40

Total

24

72

61

77

114

163

Systematics (simplified) (in fb)

Event selection + classification

Source

lvlv

qqlv

qqqq

HCAL calibration

 

 

10

ECAL calibration

 

 

30

jet corrections

 

 

9

QCD generator

 

 

23

Background normalization

13

30

84

Bhabha generator

4

 

 

Luminosity(0.42%)

9

35

39

mW

6

 

10

Colour reconnection

 

 

25

Bose-Einstein

 

 

29

WW generator

 

 

23

WW fragmentation

 

 

17

MC statistics

15

61

36

photon veto

23

70

 

E12 veto

10

 

 

4f-CC03 correction

27

54

8

lepton id

2

45

 

lepton isolation

 

56

 

probability discrimination

 

46

 

beam gas

11

30

40

Total

24

114

163

 

Branching ratios in %

channel

189 GeV

161+172+183+189 GeV

SM

W-->Hadr.

66.37 ± 0.77 ?

67.04 ± 0.65 (± 0.35)

67.5

W-->ev

11.04 ± 0.57 ?

11.32 ± 0.46 (± 0.18)

10.8

W-->µv

11.47 ± 0.55 ?

11.08 ± 0.44 (± 0.16)

"

W-->v

11.09 ± 0.74 ?

10.48 ± 0.55 (± 0.23)

"

 

Vcs

189+183+172+161 GeV

183+172+161 GeV

0.954 ± 0.030 (stat.) ± 0.017 (syst.)

1.043 ± 0.058 (stat.) ± 0.026 (syst.)


 

Plots

lvqq channel

qqqq channel

Below are the NN14 output, y34 and the 14 input distributions of the NN after preselection. The NN19 result is also given for its preselection. Data are black dots. MC is normalized to the quoted luminosity (shaded area is the total background including non-4q events. A binned log likelihood fit over the whole range of the distribution is depicted by the smooth black line. The same fit is also performed with a second parameter: a background normalization factor. This fit is depicted by the red line. A simple event counting above or below a cut, set to optimize efficiency*purity, is also performed. Results are given at the top of each figure. Last plots show the variation of the cross section obtained for each distribution with the standard 1 parameter fit, the resulting error, the same for the 2 parameter fit and its error and finally the value of the normalization factor obtained from the 2 parameter fit.