************************************
               * Minute of the 11th April meeting *
               ************************************
 
       Following last week meeting , the amount of work to
   be done for the diferent channels was precised :
 
   Hadrons
   -------
 
       TPC selection : all numbers have been reevaluated with
                       the same programme and the same procedure
                       for the systematic evaluation .
                       Monte Carlo off peak will be useful , especially
                       for the early years . Kingal level Monte-Carlo
                       is sufficient .
      CALO selection : Analyse to be redone for 90-91 . DST are
                       needed .
                       Off peak Monte-Carlo needed (full generation)
                       for 90 et 91 off peak points.
 
      Electron       : Lee Thompson sent a message listing the
      --------         work to be done :
                       1 Create MC data sets with UNIBAB for years prior
                         to 1993.
                       2 Re-performing the selection for 1990 , 1991
                         1992 data : the N-tuple used by Helge are not
                         available .(During the meeting it appeared
                        unclear if Helge has still the N-tuple or not.)
                       3 Tuning the final selection to reduce systematics
                         This involves quite a lot of work
                       4 When final energies are known t-channel substr-
                         action and backgrounds have to be reevaluated.
 
                         For the point 3 , 2 ways me be followed :
                           - Pere pointed out that the final selection
                          should be tuned using UNIBAB and that we
                          should study the possibility of avoiding
                          t-channel substration . It was thought that
                          in would be nice to have at the EW meetin of
                          the Aleph week a presentation upon that
                          possibility.
                            - The other way being change of cos theta *
                              range .
    Muon
    -----                 - Monte Carlo is needed
                            From further discussion , Monte-Carlo
                            is going to be produced by H.Videau .
                          - Data can be selected from the selected
                            sample of Ecole Polytechnique selecting
                            CLAS 24 from 93 to 95 , and CLAS 15 for
                            the preecedings years . A.Venturi is in
                            contact with I.Riu .
 
    Tau                  After the meeting G.Ganis send a message
    ----                 indicating :
 
                          - He has been listing the available Monte-Carlo
                            it should be OK for the tau , when the
                            difference in the Galeph/Julia processing
                            are clarified
                            Monte-Carlo with Unibab is needed . This
                            is already covered by the electron channel
 
   Luminosity
   ----------
                     The systematic error on luminosity for the SICAL
                     can be lowered to 0.11% ( from Jadach et al..)
                     For the LCAL the best is to stay with the
                     preceeding  errors . Comment from LCAL experts
                     is needed.
   Run selection
   -------------     Scanbook has been updated for 1995 , putting
                     in EA all the pre-scan period. It was pointed
                     out by Andrea that the timing problem may affect
                     the muon part in this 1st period. Andrea will
                     investigate.