[BLAST_ANAWARE] Error in combining asymmetries note

From: Douglas Hasell (hasell@MIT.EDU)
Date: Sun May 22 2005 - 15:09:22 EDT

Hi,

     Apologies to anyone who actually read my note on combining
asymmetries.

     Vitaly has pointed out that we do not make simultaneous
measurements of the asymmetry (except when we do left-right
asymmetries). Rather we do separate measurements for beam and target
spin combinations and normalise to charge. This means the statistics
are Poisson and not correlated

     I will rework the note but I don't think things will factor out
as nicely now which means combining measurements will be tedious.

                                                                         
                       Cheers,
                                                                         
                                       Douglas

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