Pair Symmetric Background

Parallel:
Perpendicular:

Below are some plots for a two dimensional fit. The perpendicular results appear to have a stronger theta dependence.

Parallel:
Perpendicular:

Below are the 2D fit results

Parallel:
Perpendicular:

Background asymmetry fit

Below are the asymmetry results from selecting events with a cherenkov double track hit (ADC > 2) only. These events come only from pairs produced in the tracker.


Other issues

If we trust the background correction above, then the low x data still could use improvements. Possible sources of low x problems could be

  1. Unknown low energy background
  2. Dilution not calculated correctly using unpolarized structure functions
I think that #2 is likely because F1F209 is not usable below x=0.35. This roughly corresponds to a cut at E'>1.3GeV. Also, this is why I used CTEQ for the unpolarized cross section when calculating the pairs background. In hindsight I should have just used the NMC fit.

[ICO]NameLast modifiedSizeDescription
[PARENTDIR]Parent Directory   -  
[IMG]A180A80_47_bg_fit_40..>2015-01-09 17:56 53K 
[IMG]A180A80_59_bg_fit_40..>2015-01-09 17:56 62K 
[IMG]fit_simulation_ratio..>2015-01-09 17:56 13K 
[IMG]fit_simulation_ratio..>2015-01-09 17:56 14K 
[IMG]fit_simulation_ratio..>2015-01-09 17:56 13K 
[IMG]fit_simulation_ratio..>2015-01-09 17:56 14K 
[IMG]twodim_background_pa..>2015-01-09 17:56 30K 
[IMG]twodim_background_pa..>2015-01-09 17:56 39K 
[IMG]twodim_background_pa..>2015-01-09 17:56 30K 
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[IMG]twodim_background_pe..>2015-01-09 17:56 32K 
[IMG]twodim_background_pe..>2015-01-09 17:56 39K 
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