Thursday 28 August 1998
                                                Ian Tomalin


                MINUTES OF THE 19TH BEW MEETING
               =================================

 Agenda
 -------
   1) Discussion of what else needs to be done before we circulate the
      first draft of our paper. 

   2) Studies of ISR/FSR interference using qq events (M.N. Minard)

   3) Measurement of A_FB for c-cbar events (C. Goy)

   4) Discussion of qq results at 189 GeV ... (M.N. Minard, F. Teubert)

-----------------------------

Discussion of Draft Paper
==========================

  First draft should be ready very soon. Ian was volunteered
to edit it. Apart from general tidying up, following points outstanding:

   1) Tables giving breakdown of systematics and backgrounds for
      both hadronic and leptonic selections.

   2) Understanding of why gamma gamma background needs to be
      normalized in dimuon selection.

   3) Z' limits. Marc will present limits on sequential Z' next
      time, which are expected to be better than CDF. 

   4) S matrix fit. Marie-Noelle is not convinced that this is
      meaningful. However, she will present results on it next time
      for discussion.

   5) Frederic will delete contact term models which can't compete
      with low energy experiments (i.e. parity violating ones).

   6) Ian will redo sneutrino limit histograms using smaller bin 
      size.

   7) Frederic will create a copy of the contact term program,
      modified to put limits on leptoquarks. This will solve 
      a few outstanding issues in the leptoquark fits, such 
      as correlated systematics and their use of a different 
      ISR correction to the other new physics fits.

Studies of ISR/FSR interference using qq events (M.N. Minard)
==============================================================
  
  ZFITTER predicts that ISR/FSR interference is largest when
qq system makes small angle to beam axis. Is also biggest when
centre of mass energy is low. At 183 GeV, Marie-Noelle measured
differential cross section of hadronic events vs. cos(theta), but
did not have sufficient precision in bins near cos(theta) = 1 to
check ISR/FSR interference predictions.
  She proposes doing measurement at 133 GeV, where effects are much
larger. To do this new KORALZ MC is needed at this energy.
  Ian suggested that ISR/FSR interference also depends on energy
of photon, so cos(theta) might not be optimal variable for study.

Measurement of A_FB for c-cbar events (C. Goy)
================================================

   Corinne selects c-cbar events using the same neural net as used for
the c-cbar cross section measurement. The asymmetry is then determined
by combining several variables such as jet charge, lepton charge etc.
in a neural net. Result A_FB(cc) = 0.97 +- 0.26. Still very
preliminary. Studies of systematics not yet complete. These may be large,
so suggestion made to use Andy Halley method plus corrections for jet
charge. This analysis can be put in the BEW paper if finished in time.

Discussion of qq results at 189 GeV ... (M.N. Minard, F. Teubert)
==================================================================

  Marie-Noelle gets cross section of 19.25+- 0.62 pb, agreeing with
S.M. The statistical error is now smaller than systematic error, so
more work needed on latter.
  For events with thrust < 0.75, she sees significant deficit:
519 seen in data for 617 expected. Could imply low WW cross section.
Frederic does not see this, but he is applying a cut requiring that 
the visible mass of the event exceed 70% of sqrt(s). 

Next Meeting: 8th September at 10:00 in 2-1/034.
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