[G8b_run] New Polarization Tables

[Volker Crede]

Hi all,

I have a few pictures to show for the two-pion analysis comparing the old polarization tables with the new ones:

     http://hadron.physics.fsu.edu/~crede/FILES/polarization.root

The nomenclature of the histograms in the ROOT file is Difference_00_[energy bin] comparing the observable I_s using the new and the old values for the degree of polarization. I have used an average polarization for each energy bin. At this point, the energy bins are 50-MeV wide:

1100 - 1150 MeV        Bin 1     1.3 GeV data set
1150 - 1200 MeV        Bin 2
1200 - 1250 MeV        Bin 3
1250 - 1300 MeV        Bin 4
1300 - 1350 MeV        Bin 5     1.5 GeV data set
 etc.

There are four different topologies (either missing a particle or detecting them all) and each energy bin is further broken up into 20*20 = 400 bins for the two angles in the rest frame of the pions: 1600 bins maximum (acceptance kills many, though) that can be compared per energy bin.

I do not observe any effects resulting in a systematic shift of these distributions. All difference distributions give good Gaussian distributions; they are definitely all symmetric. The same is true (no systematic problems) when I look at individual topologies.

This is all a good sign. I will further look into what Mike did for the single pion.

Best wishes

       Volker