analysis mu-decay

[Jules DEUTSCH <jules.deutsch@fynu.ucl.ac.be>]

Dear Peter and Claude,
We had a discussion with René concerning the analysis and we would 
appreciate your feelings.
René reminded me of the inpurities which made difficult to adjust a pure 
exponential to the results. It seemed to me that these impurities have 
necessarily a shorter life-time then the main signal and so starting the 
fit at some later time may allow (with loss of statistics) to purify the 
result.
Of-course a second factor may influence this method. Because of the 
migration of the neutral muon-proton system the decay takes place at a 
different place then the muon-stop. So (depending on the fiducial 
volume) you loose late signals. This pitfall pushes the result into the 
same direction as the impurities, so it seems to me. There is however a 
second factor to your disposal for this effect: the radius of the 
"fiducial" volume "muon-stop/decay".
Am I wrong,?
Looking forward to your response and good luck,
                                                                      Jules