[Sane-analysis] Update to wiki page on pion production

[Whitney R. Armstrong]

Hello Everyone,

I have updated my background ratio simulations. At the moment I am running 
simulations for all 4 beam/target configurations. The plots I was showing on 
Weds have been improved. The DIS cross section I was using was the born cross 
section.  Therefore, at low E', I was under estimating the cross section. When 
I fixed this to use the radiated cross section (internal and external) the 
asymmetry correction looks much better.

Here is the ratio using the born DIS X sec :
http://quarks.temple.edu/~whit/SANE/analysis_main/results/background/simulated_background3_1002.png

And with the radiated DIS x sec:
http://quarks.temple.edu/~whit/SANE/analysis_main/results/background/simulated_background3_1080.png

To see the difference after applying the correction compare these two plots.
The first over corrects leading to a much larger asymmetry at low x (E') and 
the second one seems to be consistently flat.  

http://quarks.temple.edu/~whit/SANE/analysis_main/results/asymmetries/A180A80_59_bg_sub_308.png
http://quarks.temple.edu/~whit/SANE/analysis_main/results/asymmetries/A180A80_59_bg_sub_309.png

The improved simulation's correction looks much better now. Of course, these 
have much lower E' cuts than we will ultimately use in order to investigate the 
background correction. 

That is it for now.

Cheers,
Whitney Armstrong




On Tue, Oct 14, 2014 at 07:39:39PM -0400, O. A. Rondon wrote:
>In advance of tomorrow's analysis meeting, I have updated my wiki page
>with results and plots of my uncertainty weighted fits to the Yerevan
>charged pion photoproduction data, which include estimated uncertainties
>coming from statistics, systematics, and data digitization.
>
>I also have fitted the cross section for neutral pions, using the
>weighted average of the charged pion ones. I was using the simple
>average before now, in the absence of uncertainties.
>
>Finally, I've run epc with the new weighted fit to negative pions on C,
>to get the corresponding electroproduction cross section at 5 GeV and 13
>deg., to compare with the DESY data.
>
>The updates are indicated by *NEW* labels here:
>https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Inclusive_pion_and_nucleon_electroproduction
>
>I will later include more details of the procedure used to estimate the
>errors.
>
>Cheers,
>
>Oscar
>
>
>
>
>
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