Thursday 17 December 1998
                                              Ian Tomalin


                MINUTES OF THE 25TH BEW MEETING
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Agenda
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Christmas discussion of plans for 1999 ...

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MANPOWER
=========
  Sufficient manpower available to do 189 GeV dilepton analysis for 
Spring conferences. However, will need additional people for final 
189 GeV final results and for 195 GeV analysis.

  Someone needed to measure 189 GeV bb cross section. Good project for
diploma student.

  Volunteer needed to do direct search for excited leptons after
next Summer, using 195 GeV data.

DIFERMION CROSS SECTIONS
=========================
Try to reduce systematic errors, particularly for e+e- and qq final
states

  e+e-: Dominant systematics are calorimeter energy scale
        and ISR background.
        => Acceptance cuts to avoid ECAL cracks ? 

  qq  : Dominant systematic is energy response of detector.
        => Try to reduce using new approach correcting individually
           each ENFLW object type. 

THEORY and MC
==============
  Jadach's new KK MC should be implemented in KINGAL in January.
Will need testing, so probably can't be used for Moriond results.
For qq, will probably have to switch of KK simulation of FSR and of
ISR/FSR interference, and instead let PYTHIA do the FSR, so that
gluon radiation is emitted before FSR. Therefore can't use full
potential of KK MC.

  Discussion of whether we need to change definition of exclusive
cross section. (Now in terms of invariant mass of propogator for qq
and outgoing lepton pair for ll). Most people not favourable to this.

LEP AVERAGE RESULTS
====================
  Thought will be needed on how to average our results with other
LEP experiments. Non-trivial as OPAL defines cross section differently
to us, and quotes different theoretical errors. Should discuss in 
LEPEW group ?

Z' LIMITS
==========
  Currently don't use Bhabha results, as ZFITTER can't predict Bhabha
cross section. May be possible to do this (at least for zero Z-Z' 
mixing angle) using similar method to contact term fit. 

DIRECT SEARCH FOR EXCITED LEPTONS
==================================
  Analysis using 189 GeV running over Christmas. Should be finished
when BHWIDE and other MC samples become available. 
  Extension of analysis looking for l* -> Z/W l/nu still to be done.
  Intention to produce paper on 189 GeV results and a Summer conference
paper on 195 GeV data.