[Clas12_rgb] concerning figure 5 of nDVCS paper draft, VGG predictions compared with our data
Valery Kubarovsky
vpk at jlab.org
Wed Jun 5 10:27:49 EDT 2024
Dear Adam,
The 3D plot is quite challenging to interpret. Could you please generate a 2D plot with a color scheme instead?
I also noticed that your reduced chi-2 values are excessively high. We need to focus on the values around the chi-2 minimum, extending up to [chi-squared minimum +10]. This range will help us estimate parameter errors more accurately. Specifically, the ellipse at chi-2 =minimum +1 will indicate the expected error bars for our parameters.
I don't think that we can ignore the VGG because it is model. We are forced to work with the models any way and it is the only way to get access to Ju and Jd in this particular case.
Best regards,
Valery
________________________________
From: ajhobart <ajhobart at jlab.org>
Sent: Wednesday, June 5, 2024 04:07
To: Valery Kubarovsky <vpk at jlab.org>
Cc: clas12_rgb at jlab.org <clas12_rgb at jlab.org>
Subject: concerning figure 5 of nDVCS paper draft, VGG predictions compared with our data
Dear Valery, RGB,
following our discussion during the last RGB meeting concerning figure 5
of the nDVCS paper draft, we have performed a scan using VGG of
different values of Ju and Jd and evaluating for each set a chi2 with
the 9 data points that we extract with our analysis. Indeed, this scan
has shown that there are other values of Ju and Jd that are more
"preferred" by our extracted harmonics than the ones we had initially
put in the paper. We have updated figure 5 accordingly (I attach it here
also).
color code for figure 5
// ju jd reduced chi2
//-0.45 0.2 3.03423 blue
//-0.25 0.15 3.19268 black
//-0.2 0.15 3.1004 Red
Attached also you will find the plot with Ju, Jd and chi2 value for each
set as you requested. It seems that there is a particular preferred
range for Jd (around 0.15) but none for Ju.
thanks
Best regards
Adam
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