The cross section is officially available for both programs, has been compared to our results and given at La Thuile. For the future it is necessary to understand the difference Gentle-KoralW which is about 0.5% . It is believed to be due to different approximations in the incomplete order alpha treatment, these approximations are not necessary in the full order alpha calculations of the two new programs. Another issue to be sorted out in the near future is the difference RacoonWW - YFSWW3 which is larger than the expected 0.5%. Click here to have more details and to see the latest nice plots.

The 189 GeV analysis has been repeated on the latest data. Expected errors have been computed from the fit results at individual energies, with different windows and with / without the Chi2 cut. The calibration curve has been checked for the mass and width. The apparent antilinear behaviour of the standard model sample (=mass and width related by sm expectation) for the width is not understood, and needs further studies for the final result. However the non-sm sample (fix mass and vary width) which has a much larger lever arm is nicely linear. Another effect which has been found is an apparent dependence of the mass on the P(Chi2).gt.0.01 cut, the mass vary by 100 MeV with and without. This was not there at 189 GeV. Monte Carlo studies by Oliver seem to indicate the effect is at 2 sigma level. No effect is seen on the width. Many other studies (binning, widows, etc.) show nice stability.

Many other checks done by Guillaume, results in agreement with Barbara findings on the mass. He has also checked the result in function of old/new montecarlo. Differences at level of two sigmas are seen, not clear if due to the improvements in the MC (Geisha bug corrections, etc) or to statistical fluctuations. Since we have enough statistics to perform a 1D measurement with the new MC we decided to use the new improved MC for the preliminary Winter Conferences results. Guillaume has done preliminary 3D measurements at 196 and 200 GeV, he observes the improvement already seen at 189 GeV.

The tau analysis of the 189 GeV draft 2 (gold selection) has been repeated in a simplified version on 19x GeV data. The analysis is 1D (was 2D on the paper) and the event error is required to be below 5 GeV. The binning is fixed at 500 MeV (was variable in the paper). All the checks on 19x GeV data are successful (good linearity, binning, old vs new mc, etc.)

The 189 draft2 analysis has been redone on 19x GeV data. NN14 has not been retrained, a small degradation of performance has been observed (see last minutes). Linearity is good. Various checks OK.

1. Mass from electrons and muons in semileptonics (difference w.r. to draft2 : 1D result).
2. Mass from taus in semileptonics (difference w.r. to draft2 : 1D result, fixed binning).
3. Mass from 4q (same as draft2)
4. Width from semileptonics e, mu (same as draft2)

You can see a summary of the results and the combination by clicking here

A new selection on single W decaying to the hadronic channel has been presented by Vincent. It is based on a neural network with 10 input variables of which 4 have been specifically designed to reject the background from WW semileptonics with taus. Indeed often in this channel the tau is mixing to one of the jets therefore simulating an hadronically decaying single W. Several structures of the network have been tried, a 10-16-1 is the final choice . An improvement of 10% in the quality factor sqrt(eff*pur) has been obtained. As far as the leptonic selection is concerned vdet hits for the electron channel are always required in order to suppress gamma conversions. The definition of the cross section has been changed to match the common LEP definition. The cross section up to 202 GeV has been measured. A conference note is in preparation. Result to be approved for LEPC and Moriond.

Tim has shown that he can obtain now good linearity for all the couplings, residual problems were due to wrongly mixed samples. Two more systematics have been added, one related to the PDF approximations and the other to four-fermions reweighting. The results are available for 19x GeV data. All couplings (CP conserving and not) are in agreement with SM, the biggest deviations being in Im(g4_gamma) and Im(g4^z) (about 2 sigmas). The two are strongly correlated. A conference note is in preparation.

The standard Aleph analysis has been repeated on 19x GeV data, as well as a new mixed events analysis inspired by Delphi. Have a look by clicking to Bolek transparencies. The new standard result is somewhat less far from BE between different W’s (2.2 sigmas instead 2.7 sigmas following the convention of the paper) while the mixed events technique analysis shows a rather strong disagreement with BE between different W’s. It has been also shown that the 2q background has an influence on the Q**2 distribution in the mixed event technique. Indeed a 2q in 4 jets can simulate a W pair with very strong BE between W’s (everything is originating from the same initial string by definition !). The analysis should be improved by decreasing the 2q bkg as much as possible. The plots, without quantitative statements in the second case, will be shown at LEPC and Moriond.

The standard multiplicity distributions have been done using 19x GeV data. Some disagreement with MC is seen in the soft tracks region, the other way around with respect to SK1 expectations (less tracks in 4q than 2*semileptonics), same direction as Herwig. The statistical significance has to be evaluated. It is not clear if this standard method will ever be useful to discriminate between models. For this reason Nick has started to study new Lorentz Invariant variables, hoping to get more sensitivity . Preliminary studies look promising. As far as the standard analysis is concerned it has been proposed to sum over all energies for the Thursday meeting. At The Thursday has then been decided to superimpose also MC expectations from models and evaluate stat. significance. To be rediscussed on Friday, the 10^th.

The W mass and width paper at 189 GeV is at draft 2 stage with comments received and mostly incorporated. Main issue before editorial board is the wish to see the result of Herwig with CR. The draft2 will be emended by a couple of sentences still under discussions (Herwig CR, overlap between 4q and taus) and declared conference note.

The TGC paper is close to be ready as draft 1. The correlation between OO and LL methods will be available only for draft2. An amazing 3d projection has been shown (online rotation on the web has been proposed !!!)

The cross section at 189 GeV paper is basically ed board ready.

Conference notes at 19x GeV to be prepared : W cross section (Anne), W mass and width (Jason), TGC from LL (Tim), single W cross section (Vincent), Bose Einstein correlations (Bolek), multiplicities (Nick).