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<p>the number of fits having the particular chi2, sorry I have
omitted it from the previous screenshot, here it is <br>
</p>
<p>Thanks</p>
<p>Adam<br>
</p>
<p><img src="cid:part1.vRm0yo08.Q8oxxbMp@jlab.org" alt=""></p>
<div class="moz-cite-prefix">Le 05/06/2024 à 15:53, Sebastian Kuhn a
écrit :<br>
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cite="mid:8BEEDAB2-053E-447D-A81E-DAB5EFAAC722@jlab.org">
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Thanks for the explanation. Can you tell me what information is
coded in the color of each block?<br
id="lineBreakAtBeginningOfMessage">
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<div>On Jun 5, 2024, at 9:39 AM, ajhobart
<a class="moz-txt-link-rfc2396E" href="mailto:ajhobart@jlab.org"><ajhobart@jlab.org></a> wrote:</div>
<br class="Apple-interchange-newline">
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<p>Hi Sebastian,</p>
<p>For figure 5, the limit on the reduced chi2 that I put
affects the set of accepted sets of Ju and Jd. The Limit
is now 3.5, if I move it ot 5 I have a set of accepted
sets of Ju and Jd that contains positive values of Ju
(50% of selected fits). So maybe it is our choice that
gave the impression that only negative Ju values are
reasonable!<br>
</p>
<p>My reasoning is that there are preferred values for Jd
(positive around 0.15) but no preferred values for Ju, I
attach here again the same plot showing Ju vs Jd versus
chi2 from a different angle. It shows that on the Ju
axes, the distribution for chi2 is almost Flat.<span
id="cid:part1.VRBGEUqY.X5FX6T4d@jlab.org"><gsudaQzbHjfz8PDK.png></span></p>
<p>However, my take on this is that rather none of the
combinations of Ju and Jd reproduces the data correctly.
Even for the ones we chose to put in the figure 5, it is
quite clear that the trend seen in the data is not
consistant with the curves. Moreover, VGG predictions
remain model dependant predictions and we do not intend
to consider them as a strong physics conclusions on the
values of Ju and Jd.</p>
<p>thanks</p>
<p>Best regards</p>
<p>Adam<br>
</p>
<div class="moz-cite-prefix">Le 05/06/2024 à 14:38,
Sebastian Kuhn a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:095C1E05-E642-473F-AB4B-D1F0873ACEF2@jlab.org">
<pre class="moz-quote-pre" wrap="">Just a quick question: Why are all the preferred values for J_u negative and for J_d positive? This seems very counter-intuitive, given that the quark helicity contributions to J have the exact opposite sign. This would require enormous (overcompensating) orbital angular momenta to explain.
- Sebastian
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">On Jun 5, 2024, at 4:07 AM, ajhobart via Clas12_rgb <a
class="moz-txt-link-rfc2396E"
href="mailto:clas12_rgb@jlab.org"
moz-do-not-send="true"><clas12_rgb@jlab.org></a> wrote:
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
<bsa_q2xbjt_coloronline_newVGG.pdf><jujdchi2.png>_______________________________________________
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