Minutes of the EW Group meeting held on 22-Feb-97
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 Present: A. Venturi, A. Lucotte, B. Bloch, M. Girone,  
          MN. Minard, M. Pepe-Altarelli

 Main Topics: 

TAUS:       The problem raised inside the EW group by Gerardo 
            is discussed. This problem concerns the selection 
            of events without charged track with energy greater 
            than 2 GeV and with at least one 2 GeV photons:
          
            MG reports on the status of the taus selection: data
            have been re-run with sagitta correction (affecting 
            selection at the level of 3.10^{-5} as for muons) and 
            discovered a bug in the Energy Flow package, now corrected.
            Background estimations are not very sensitive to these 
            modifications. Although new selection efficiencies are not
            yet completed, a part of the note is now available on 
            the Web.
 
LUMINOSITY: BB pointed out that she could not provide a note including
            final numbers on luminosity since no FINAL energy numbers 
            are available at that time for 93-94 and 1995. The SiCAL 
            note concerning this period of data taking is therefore 
            freezed. AL will contact Guy Wilkinson / M. Koratzino to 
            have the lastest news from the LEP energy Group and reports
            asap.

ELECTRONS:  For Bolek Pietrzyk, MP reported about the estimation of 
            the THEORETICAL uncertainties affecting the t-channel 
            subtraction. 
            --> In the previous ALEPH EW paper published, the error 
                was 2% at the Peak as well as off-peak. 
            --> Now, new estimations lead to :
                     0.5% ... for E_cm < E(Peak)
                     2.5% ... for E_cm = E(Peak)
                     4.5% ... for E_cm = E(Peak)+2