pi+pi- final state

Minutes of the weekly pi+pi- meeting held on 5/10/1994
Present:
C.Touramanis, T.Ruf, M.Carrol, P.Bloch, M.Fidecaro, H.J.Gerber, 
A.Schopper, C.Yeche

T.Ruf summarized the last meeting. The pi+pi- MC symmetrisation
has started and should be finished end of this week and then 
Frederic starts to symmetrize step by step P23, P21....

Christophe presented new results about his analysis. One source of 
differences for M1M2 and M2M1 was found to be the use of decays 
inside PC2 although the trigger classified this events as 2prim events.
After removing these events there remains no significant difference
in the normalisation of M1M2 and M2M1, 2p and 4p events agree only the 
normalisation for 3p shows a 3sigma deviation.
A systematic shift of eta+- and phi+- for various cuts on the charged
kaon momentum might be the reason of a correlation between the physics and
geometric effects.  
Both Christos and Christophe find a regeneration correction of 3.6^0 for
phi+-. The regeneration also improves slightly the agreement between
2p, 3p and 4p normalisation.
A study will be done about how this correction changes by varying the lifetime
region used for normalisation.

The next weekly pi+pi- meeting will be on wednesday 12th october 10am
in the CPLEAR meeting room.

Thomas