Minutes of EW meeting  13-march-1997
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1. Hadrons : a preliminary copy of the note by Arnaud on qq selection
   was given by Marie Noelle. She still wanted to check a few things
   and after the ps will be made available on our web page.

2. The question of the two peak periods in 91 (whether to split them
   or put them together in one point) was discussed again. 
   It was suggested that Bolek should try the fit in the two cases
   to see whether there is any difference between the two options
   (none is expected).

3. Gerri gave Monica a preliminary version of the note on background
   studies which is almost complete. He also presented some 
   additional studies, not yet included in the note, to address
   the question of the different estimate of the hadronic background
   w.r.t. Edwige. His study showed that the "single hemisphere" variables
   are well simulated by the qq Monte Carlo. To estimate the effect of
   correlations he has randomly combined broken events and then
   compared distributions and effects of cuts on data and Monte Carlo.
   As a consequence of the reasonable agreement observed, he estimated
   that the error on the qq contamination should be 15%, where this
   error is the statistical error associated to the procedure used.
   This study will be written down, in order to compare with what
   Edwige and Ioana have done. 
   A second note on the efficiency is being completed.

4. Andrea will take care of propagating the information on then Web, so,
   if you want to change something on our page, please get in touch with him.

5. Some short status report on the so-called llv events, which always
   produce some confusion, are promised by Frederic and Ioana.

6. Monica keeps on adding material to the draft, but clearly INPUT is
   needed by the different analysis groups.
   PLEASE PROVIDE SOME MATERIAL FOR YOUR SECTION!

7. Next meeting: thursday 27 at 14:00; room to be announced