[Sane-analysis] Update to background asymmetry write-up

[O. A. Rondon]

I have updated my draft write-up about the procedure for applying the
background corrections to our measured asymmetries.

The previous value of the neutral pion longitudinal asymmetry A_LL,
based on T. Toole's E155 thesis, has been replaced with the A_LL value
from Luwani's fit to the E155 published data. T. Toole's thesis included
some additional points but, since the two results agree, using the
published data should simplify citations in our planned publications.

The write up is highlighted as the "NEW" item here
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Oara

Cheers,

Oscar

O. A. Rondon wrote:
> Hi,
> 
> I have updated my draft write-up about the procedure for applying the
> background corrections to our measured asymmetries that we discussed at
> last week's meeting, with a section on specific application to A180 and
> A90, using the fits to SLAC inclusive pion longitudinal and
> perpendicular asymmetries posted on the wiki
> 
> https://userweb.jlab.org/~rondon/analysis/pairs/aparaper_sane_bkgd6-4.pdf
> 
> The procedure replaces the approximate modification of SLAC's
> asymmetries measured on 15N, compared to SANE 14N, by an exact
> derivation.
> 
> It also considerably simplifies the application of the pairs asymmetry
> correction to our near-perp asymmetry. One important thing to keep in
> mind is that the systematic errors due to the pairs dilution and
> asymmetry can be applied in a straightforward way following the formula
> in slide 3 of the write-up ref.[3].
> 
> This is a draft and it may have some minor changes later.
> 
> Cheers,
> 
> Oscar
> 
> 
> 
> 
>