1. Cross Section meeting, 5 Nov 1999 Maria Girone1 Preliminary results on the WW fully leptonic cross section for the LEPC Maria Girone Imperial College

2. Cross Section meeting, 5 Nov 1999 Maria Girone2 Selected events WW run selection: 29.043±0.084 pb -1 @ 192 GeV 80.109±0.142 pb -1 @ 196 GeV 82.901±0.147 pb -1 @ 200 GeV 34.533±0.096 pb -1 @ 202 GeV Selected events: 31 @ 192 GeV 99 @ 196 GeV 105 @ 200 GeV 40 @ 202 GeV All efficiencies and backgrounds have been calculated at the correct energy

3. Cross Section meeting, 5 Nov 1999 Maria Girone3 Selected events (cont’d)  e   ee  e  @192 4 7 4 1 6 9 @196 12 22 22 10 10 23  @200 13 22 20 12 15 23 @202 5 7 11 7 2 8

4. Cross Section meeting, 5 Nov 1999 Maria Girone4 Results  l l = 1.53±0.30(stat) pb @ 192 GeV (SM = 1.80)  l l = 1.76±0.20(stat) pb @ 196 GeV (SM = 1.83)  l l = 1.74±0.20(stat) pb @ 200 GeV (SM = 1.85)  l l = 1.62±0.29(stat) pb @ 202 GeV (SM = 1.86)

5. Cross Section meeting, 5 Nov 1999 Maria Girone5 Results (cont’d)  l l = 1.527±0.302(stat) pb @ 192 GeV    = 0.232  0.196 (stat) pb    e = 0.397  0.202 (stat) pb     = 0.138  0.134 (stat) pb  e e = 0.003  0.298 (stat) pb    = 0.296  0.132 (stat) pb  e   = 0.460  0.173 (stat) pb

6. Cross Section meeting, 5 Nov 1999 Maria Girone6 Results (cont’d)  l l = 1.758±0.196(stat) pb @ 196 GeV    = 0.222  0.123 (stat) pb    e = 0.384  0.128 (stat) pb     = 0.412  0.118 (stat) pb  e e = 0.142  0.072 (stat) pb    = 0.156  0.068 (stat) pb  e   = 0.438  0.106 (stat) pb

7. Cross Section meeting, 5 Nov 1999 Maria Girone7 Results (cont’d)  l l = 1.740±0.196(stat) pb @ 200 GeV    = 0.225  0.123 (stat) pb   e  = 0.365  0.116 (stat) pb   = 0.321  0.122 (stat) pb  e e = 0.170  0.079 (stat) pb    = 0.249  0.078 (stat) pb  e   = 0.407  0.101 (stat) pb

8. Cross Section meeting, 5 Nov 1999 Maria Girone8 Results (cont’d)  l l = 1.621±0.291(stat) pb @ 202 GeV    = 0.233  0.186 (stat) pb    e = 0.190  0.186 (stat) pb     = 0.540  0.199 (stat) pb  e e = 0.305  0.148 (stat) pb    = 0.028  0.071 (stat) pb  e   = 0.334  0.145 (stat) pb