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<p> I introduced three more curves correspondig to resonable reduced
chi2values and positive Ju (attached plot)<br>
</p>
<div
style="color: #ffffff;background-color: #000000;font-family: Consolas, 'Courier New', monospace;font-weight: normal;font-size: 14px;line-height: 19px;white-space: pre;"><div><span
style="color: #7ca668;"> // ju jd reduced chi2</span></div><div><span
style="color: #7ca668;"> //-0.45 0.2 3.03423 blue </span></div><div><span
style="color: #7ca668;"> //-0.25 0.15 3.19268 black </span></div><div><span
style="color: #7ca668;"> //-0.2 0.15 3.1004 Red </span></div><div><span
style="color: #7ca668;"> // 0.05 0.1 3.4503 reddishlike </span></div><div><span
style="color: #7ca668;"> // 0.1 0.1 3.39791 green</span></div><div><div
style="color: #ffffff;background-color: #000000;font-family: Consolas, 'Courier New', monospace;font-weight: normal;font-size: 14px;line-height: 19px;white-space: pre;"><div><span
style="color: #7ca668;"> // 0.35 0.05 3.77249 gray</span></div></div><span
style="color: #7ca668;"></span></div></div>
<p></p>
<div class="moz-cite-prefix">in particular, and following FX
comment, the gray curve corresponding to Ju = 0.35 and Jd=0.05
seems to be the closest (but still far, compatible within
statistics) to what Lattice QCD evaluations suggest.</div>
<div class="moz-cite-prefix">We do not intend to show plots of
reduced chi2, this plot was intended for internal use, only figure
5 (attached her) is intended for publication.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Valery, here I put a 2D profile with Ju
vs Jd and color code corresponding to chi2 value for the chi<10</div>
<div class="moz-cite-prefix"><img
src="cid:part1.YprhNLHX.04n1UHU1@jlab.org" alt=""></div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">and for chi2<minimu chi2 +1</div>
<div class="moz-cite-prefix"><img
src="cid:part2.ITS0N0Ud.xfftDXra@jlab.org" alt=""></div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">the last plot shows that there is no
preferred value for Ju, as explained before and that Jd is
probably around 0.1 - 0.15</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">let me know what you think</div>
<div class="moz-cite-prefix">thanks a lot<br>
</div>
<div class="moz-cite-prefix">Cheers</div>
<div class="moz-cite-prefix">Adam</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Le 05/06/2024 à 16:13, Francois-Xavier
Girod a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAOKxh47su-coZQ1BvpfPmG0eDOkyLL8hhO2EVhuTt_x3cS1mvg@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Dear all
<div><br>
</div>
<div>I assume this is intended to go in the collaboration paper</div>
<div>These 2D plots are very hard to read. It's good for
intermediary steps in the internal process, when people look
very carefully at the plots and think about them for a long
time. But for publication in my opinion it would be better to
show a pair of 1D plots, one with fixed Ju showing chi2 vs Jd,
and one with fixed Jd showing chi2 vs Ju</div>
<div><br>
</div>
<div>There are some lattice calculations for these quantities,
we should be careful if we are going to publish results
suggesting the collaboration results disagree with lattice
estimations</div>
<div><br>
</div>
<div>Best regards</div>
<div>FX</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Jun 5, 2024 at 9:57 AM
ajhobart via Clas12_rgb <<a
href="mailto:clas12_rgb@jlab.org" moz-do-not-send="true"
class="moz-txt-link-freetext">clas12_rgb@jlab.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<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:part3.lVYZgMXR.Ov48k68R@jlab.org" alt=""
class=""></p>
<div>Le 05/06/2024 à 15:53, Sebastian Kuhn a écrit :<br>
</div>
<blockquote type="cite"> Thanks for the explanation. Can you
tell me what information is coded in the color of each
block?<br
id="m_4658773034113002297lineBreakAtBeginningOfMessage">
<div><br>
<blockquote type="cite">
<div>On Jun 5, 2024, at 9:39 AM, ajhobart <a
href="mailto:ajhobart@jlab.org" target="_blank"
moz-do-not-send="true"><ajhobart@jlab.org></a>
wrote:</div>
<br>
<div>
<div>
<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="m_4658773034113002297cid: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>Le 05/06/2024 à 14:38, Sebastian Kuhn a
écrit :<br>
</div>
<blockquote type="cite">
<pre>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>On Jun 5, 2024, at 4:07 AM, ajhobart via Clas12_rgb <a
href="mailto:clas12_rgb@jlab.org"
target="_blank" 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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