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Hello David, Wally, and all,</div>
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many thanks to David for preparing the slides. I agree with Wally's comments. Recalling our discussions, I believe "QCD-inspired" is to be understood more in the sense of "lattice-QCD guided". But <span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">i</span><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">n
my opinion, at this stage the exact formulations on the slides are probably not very important, as we will be able to say in words what we mean (though the wording will matter in the proposal). </span></div>
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Peter</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Gpdtc <gpdtc-bounces@jlab.org> on behalf of Wally Melnitchouk <wmelnitc@jlab.org><br>
<b>Sent:</b> Monday, January 10, 2022 11:02 PM<br>
<b>To:</b> David Richards <dgr@jlab.org><br>
<b>Cc:</b> gpdtc@jlab.org <gpdtc@jlab.org><br>
<b>Subject:</b> Re: [Gpdtc] Wednesday....</font>
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<span style="color:#9C6500"></span>*Message sent from a system outside of UConn.*</div>
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Thanks, David, for putting this together.</div>
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On <u>slide 4, <span style="">3rd bullet</span></u>: a s<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">uggestion for alternative wording for the is "Development of global QCD analysis methods with uncertainty
quantification for PDFs and TMDs, and their extension to (3D) GPDs."</span></div>
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<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><u>Slide 5, point #1</u>: t</span><span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">here might be potential uncertainty
about what exactly "QCD-inspired descriptions of GPDs and CFFs" refers to. If it is some other than model calculations of GPDs and CFFs, perhaps this should be specified a bit more explicitly?</span></div>
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<u>Slide 5, point #2</u>: is it just the <i>x</i> dependence of GPDs that is of interest, or also the î (skewedness) dependence, along with the
<i>t</i> dependence?</div>
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<u style="">Slide 5, point #3</u><span style="background-color:rgb(255,255,255); display:inline!important">: "G<span style="background-color:rgb(255,255,255); display:inline!important">lobal QCD analysis with uncertainty quantification<span class="x_Apple-converted-space"> to
extract..." Again, I would like to be careful about how "QCD-inspired descriptions" would be used to extract GFFs and GPDs, as we don't want to imply that models will be used to help determine these from data (since we may want to "test" models rather than
assume them).</span></span></span><br>
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<span style="background-color:rgb(255,255,255); display:inline!important"><span style="background-color:rgb(255,255,255); display:inline!important"><span class="x_Apple-converted-space"><u style="">Slide 5, point #5</u><span style="margin:0px; background-color:rgb(255,255,255); display:inline!important">:<span class="x_Apple-converted-space"> what
is the significance of this point being in parentheses?</span></span><br>
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<span style="background-color:rgb(255,255,255); display:inline!important"><span style="background-color:rgb(255,255,255); display:inline!important"><span class="x_Apple-converted-space"><span style="margin:0px; background-color:rgb(255,255,255); display:inline!important"><span class="x_Apple-converted-space"><u style="">Slide
6</u><span style="margin:0px; background-color:rgb(255,255,255); display:inline!important">:<span class="x_Apple-converted-space"> maybe put dots after a bullet below "William and Mary" to suggest other institutions may be involved too?</span></span><br>
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<span style="background-color:rgb(255,255,255); display:inline!important"><span style="background-color:rgb(255,255,255); display:inline!important"><span class="x_Apple-converted-space"><span style="margin:0px; background-color:rgb(255,255,255); display:inline!important"><span class="x_Apple-converted-space"><span style="margin:0px; background-color:rgb(255,255,255); display:inline!important"><span class="x_Apple-converted-space">Wally</span></span></span></span></span></span></span></div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Gpdtc <gpdtc-bounces@jlab.org> on behalf of David Richards <dgr@jlab.org><br>
<b>Sent:</b> Monday, January 10, 2022 5:06 PM<br>
<b>To:</b> gpdtc@jlab.org <gpdtc@jlab.org><br>
<b>Subject:</b> [Gpdtc] Wednesday....</font>
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<div class="x_x_PlainText">Hi All,<br>
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Before I go too far down writing something for Wednesday, please find attached some first thoughts - without figures.<br>
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The first couple of slides are basically some observations about the call, and what are likely to be the criteria (NB I could have also included diversity in all its interpretations…).
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The real issue is how much should we discuss about our discussions and aims in the context of this meeting (transparency 5), and should I say (verbally or on paper) who is currently in our discussions (page 6) - I’ve listed institutions + (incomplete) names.
I make the point on page 3 that the creation of long-term positions is an important task, but I’m not sure I would want to say in writing where those positions might be.<br>
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I’ve taken the Executive Summary document, and page 5 is basically the extraction of that. But we had some discussion before the break as to what the focus should be - for example, purely to extract GPDs, or aim to learn something more about the internal dynamics
of hadrons (ie as Christian was discussing). Similarly, Global Fitting or are there some better words we can use?</div>
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Regards,<br>
David<br>
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