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   Minutes of the meeting of the EW working group

                     13-sept-1996
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1.muons

Andrea discussed the question of the discrepancy 
observed between data and MC with radiative muon
events (with E_gamma>10 GeV) presented at the
last meeting. At that time it was suggested to
use PECO energies instead of GAMPEK(X) ones.
It was indeed shown by Andrea then there is basically
no discrepancy between data and MC if the PECO objects 
are used, indicating some miscalibration in GAMPEK(X)
for these type of events.
Andrea has therefore produced new n-tuples with
PECO energies.

Henri pointed out that for some runs in '95 there is
a slight drop of efficiency in HCAL. This inefficiency
is geometrically correlated so that di-muon events 
sneak into the standard tau-tau selection.
--> To be followed up

2.q-qbar

Arnaud said that a note on both TPC and CALO selection
for all years from 90 to 95 is being completed and will be
distributed the week before Clermond (Bravo!!).
The list of nb events/run for 90 and 91 still has to be distributed.

3. Luminosity

Brigitte said that the work on the note on the '95 lumi is
in progress. The lumi/wagon has been corrected in scanbook.
Still to do:run with BHLUMI version 4.03 to reduce the theoretical
error. However she recently received a phone call from Jadach
who would like to discuss with her version 4.04!!!

4. Bhabhas

Lee confirmed by mail that he expects to have final or quasi
final results on cross-sections and asymmetries for Clermond.
However unfortunately he will not be in Clermond.

5. Preparation of the paper.

It was stressed again that individual notes are necessary as starting
points for the preparation of the paper. They should be written 
in parallel with the analysis.

Concerning the paper on FB asymmetries, Henri said that by mid-october
he will finally have time to spend on that.

Next meeting: monday 23 sept. at 3 PM (room to be specified).