[Sane-analysis] Follow up to Re: Sane Meeting at 3:45pm Thurs Dec 3rd in L210A

[O. A. Rondon]

Hi,

I added some plots showing A1 results broken down by detector segment
(Protvino and RCS), again from Whit's tables based on Mark's
calibration, see pp. 3 and 4.

https://userweb.jlab.org/~rondon/analysis/asym/whit/A180-A80_wa_8-15a1.pdf

The plots on p. 3 show A1(W) (left) and A1(x) (right) for each segment
(Protvino - top, RCS middle). The good consistence of A1(W) among
different Q^2 data that was seen in the combined data plots of p. 1 is
repeated, showing that each detector part seems properly calibrated.
The bottom plot shows that the two segments are consistent with each other.

The plot at the bottom of p. 4 shows that the issue of Q^2 not
increasing monotonically, or even decreasing, with E' that was seen in
the old calibration (top plots) is now largely gone. Compare bottom plot
blue and green points with top left.

There seems to be some small residual issue with the RCS data for Q^2 ~
2.6 GeV^2, see bottom red and maroon points vs top right (2.6 is
just a label, the exact <Q^2> for these data is a bit higher).

It seems that the updated calibration is close to a final version.

Cheers,

Oscar




O. A. Rondon wrote:
> Hi,
> 
> Here are the plots of A1(W), A1(x) from Whit's tables using Mark's
> calibration constants. It's clear that the Q^2 - W correlation
> introduced by using the Bjorken x variable, as shown on the x vs W plot,
> produces the artifact of A1 for different Q^2 bands having different
> values at the same x. The difference is absent in the plot vs W, where
> it's clear that the Q^2 dependence at fixed W is minimal.
> https://userweb.jlab.org/~rondon/analysis/asym/whit/A180-A80_wa_8-15a1.pdf
> 
> The plots on p. 2 show SANE along with CLAS EG1b A1(Q^2>1.6 GeV^2, W>2
> GeV) results from JLab's JAM database. The EG1b data in the database is
> in narrow bins of W and it needs to be combined into wider bins with
> better statistics to make meaningful comparisons with SANE. EG1b
> collaborators have indicated that they plan to release the final version
> soon.
> 
> Cheers,
> 
> Oscar
> 
>