11th BEW meeting, Wednesday 18, February, 1998



Minutes taken by D.Schlatter
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  Agenda : 


1.- BEW
    ---  
   o News from tau  x-section (Marie-Noelle Minard)
   o Study of conversions (Marie-Noelle Minard)

2.- A.O.B 
    ----- 
   o Discussion







  
-  News from tau x-section (Marie-Noelle Minard, reporting for Elsa Merle)
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ditau analysis:   
 the bump at cos(theta)=-1 in data and not seen in MC is understood. The 
 algorithm chooses the wrong leading tracks in data but not in MC. 
 Has been changed.

 cross section for 130 GeV larger than expectation (3 sigma), 
 has to be checked.







  
-  Study of conversions (Marie-Noelle)
   ---------------------------------


MN showed clear evidence on lack of VDET material in the MC located
at large z  (one side only). This contributes to the 
underestimation of photon conversions in MC 








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Guenther Dissertori 

Wed February, 17:30:38 MET DST 1998