[Sane-analysis] Reminder of Sane meeting at 4:30pm Thurs Oct 6th in L210A

[Oscar Rondon]

Hi,

Following up on the discussion at the analysis meeting about the need to
apply target mass effects (TME) to the pertubative form of the g1p SSF
calculated from PDF's (e.g. as in Fig. 5 of the tech. note on getting
d2,) I've posted the FORTRAN code I've used to apply TME's at
https://userweb.jlab.org/~rondon/analysis/asym/world/tme/

(The d2 tech note is here
https://userweb.jlab.org/~rondon/analysis/asym/world/A2p-v5b3.pdf )

Basically, it's an implementation by Peter Bosted of the TMC analysis of
Blumlein and Tkabladze, ref. [27] of the RSS g1p paper, with the DSSV
and AAC03 PDF's called as subroutines, but any other set of PDF's could
be used, too. The program outputs the perturbative g1p and and the g1p
with TME, at constant Q^2 as a function of Bjorken x and Nachtmann xi.

Examples of the output are shown in the file aac1-stat_pdf.eps in the
folder. The plot shows g1p computed with the statistical PDF of
Bourrely, Soffer and Bucella, and the AAC03 version, with and without
TME. These curves are basically the same ones plotted in Fig. 3 of the
RSS g1p paper.

Examples of g1p with TME relevant to SANE can be found in tab "aac_2" of
the OpenOffice spreadsheet aac_q2-2.ods in the same folder. The
calculation of d2 from World + SANE A2 data is found in tab "g2bar"
including some of the plots shown in the d2 tech note.

On a related subject, the advantage of using the fits' full covariance
matrix to estimate the errors of the moments calculated from the fit is
illustrated on the plots shown in the following file, which compares the
uncertainties for C-N or Nachtmann d2 (or M23) calculated with just the
matrix's diagonal elements only (p. 1) and with the full correlations (p. 2)
https://userweb.jlab.org/~rondon/analysis/asym/world/d2-WA-fits.pdf

The moments for these plots that I posted in June 2015 were calculated
with the then current version of Whit's A2 with E' > 1.3 GeV. The
results for E' > 1.0 are on p. 3.

Cheers,

Oscar






Mark Jones wrote:
> Reminder of Sane meeting at 4:30pm Thurs Oct 4th  in L210A
> 
> 
> Cheers,
>        Mark
> 
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