[Rgc_analysis] note on the extraction of pDVCS asymmetries

[tforest at jlab.org]

Noémie:

I would like to suggest removing the "No correction" curves and points in
figures 9 and 10.  I don't see a need to plot the intermediate step unless
you goal is to reveal how much data you have in each of the target
polarization states.

I am not sure I understand the shift shown for the data in Figure 11. 
There seems to be a phi dependence?  The FC correction shifts points up if
phi < 180 and down if phi > 180?  Given the size of the FC asymmetry, I
was expecting a small shift like the one at phi=180.

Tony



> Dear Tony,
> The FC normalization between positive and negative helicities for the beam
> gives a small correction. However, the FC information is also used here to
> normalize events between the positively polarized and the negatively
> polarized NH3 datasets, which have quite different statistics.
> Best regards, Noémie.
>
>> Noémie
>>
>> The program "FCup_reading.cc" reports FC asymmetries that are on the
>> order
>> of 0.001 in natural units.  Figures 16-18 show asymmetries that are on
>> the
>> order of 0.1.
>>
>> Why do the FC corrections shift the asymmetry so much when the FC
>> asymmetry is so small?
>>
>> Tony
>>
>>
>>
>>> Dear all,
>>> Please find attached a note I wrote on the preliminary DVCS results I
>>> got
>>> with the NH3 runs that were cooked, with the intent of asking the DPWG
>>> for
>>> a release in order to talk at SPIN. The first part relates to the
>>> extraction of the target polarization and the second part to the
>>> extraction of pDVCS asymmetries. I would be happy to take any feedback
>>> into consideration !
>>> Best regards, Noémie._______________________________________________
>>> Rgc_analysis mailing list
>>> Rgc_analysis at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/rgc_analysis
>>>
>>
>>
>>
>
>
>