Preliminary ZZ cross-sections @ 189 GeV
Analyses |
e CUT (%) |
N ZZNC2 |
Nbkg(cut) |
N expected |
N obs |
D s exptd (pb) |
s ZZNC2 (pb) |
qqqq(cut) |
23.1 |
25.7 |
80.6 |
106.3 |
96 |
0.23 |
0.40 ± 0.20 |
qqqq(NN) |
15.7 |
17.5 |
22.6 |
40.1 |
35 |
0.22 (0.24) |
0.41 ± 0.20 |
t t qq |
2.1 |
2.3 |
1.04 |
3.3 |
3 |
0.53 |
0.57 ± 0.50 |
llqq |
8 |
9 |
1.6 |
10.6 |
12 |
0.24 |
0.75 ± 0.25 |
|
13.7 |
15.2 |
13.7 |
28.9 |
28 |
0.23 |
0.61 ± 0.22 |
|
17.3 |
19.2 |
24.2 |
43.4 |
37 |
0.21(0.23) |
0.43 ± 0.21 |
Ll uu (cut) |
1.2 |
1.35 |
2.3 |
3.7 |
2 |
0.92 |
|
ll uu(wis) |
1.2 |
1.35 |
1 |
2.4 |
2 |
0.72 |
0.51 ± 0.70 |
Total A |
46.2 |
51.3 |
98.2 |
149.5 |
138 |
0.13 |
0.57 ± 0.12 |
Total W |
44.3 |
49.4 |
50.4 |
99.8 |
89 |
0.12 |
0.58 ± 0.12 |
The qqqq(cut) analysis has 15% efficiency for
t t qq which is taken into accountNumbers in parentheses are obtained when an optimal
cut is performed on theNN output instead of a
fit to the NN output distribution (after the cut is applied)Overlaps between channels are properly taken into account for the cross section result