[G8b_run] New Polarization Tables

[Michael Dugger]

Volker,

I want to make sure I understand the plots shown.

Is it fair to say that if:
I_s_old is the I_s for the old polarization table

and

I_s_new is the I_s for the new polarization table

then what is shown in your plots is DeltaI_s, where
DeltaI_s = I_s_new - I_s_old?

I am not very familiar with the I_s observable. Would it be fair to say 
that
I_s_new = I_s_old*P_old/P_new , where
P_old is the polarization from the old tables and
P_new is the polarization from the new tables?

Thanks for your time.

-Michael



On Wed, 12 Oct 2011, Volker Crede wrote:

> 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
>
>
>
>
>
> _______________________________________________
> G8b_run mailing list
> G8b_run at jlab.org
> https://mailman.jlab.org/mailman/listinfo/g8b_run
>