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<div style="line-break:after-white-space">Hi Joe,
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<div>I have been trying to extract matrix elements from the correlation functions with a different method, and I have obtained quite different preliminary results. See attached a document with a description of the method and the result on various momenta for
z = 0. I will be at WM this afternoon, or we can have a zoom chat if you want to discuss some elements in there. I have tried to also consider a bit effects of excited state contamination.</div>
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<div>Cheers,</div>
<div>Herve</div>
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<div>On Jul 13, 2023, at 11:05 AM, Joseph Karpie via Hadstruct <hadstruct@jlab.org> wrote:</div>
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Hey everyone,</div>
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As promised in the morning, yesterday I had done the first fit of the xi=0 GPD, and a<span class="x_ContentPasted4" style="background-color:rgb(255,255,255); display:inline!important">s I have told some, I</span><span class="x_Apple-converted-space"> </span>was
quite dissatisfied with the results. The chi^2/dof was 220 when I concluded O(alpha) correction.<span class="x_Apple-converted-space"> </span></div>
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I think the issue can be best seen in the inaccuracy of the form factor (z=0 for us). See attached plot of F_1(t)/F_1(0). First the range in t is pretty small we can't fit very meaningful t dependence. Second the point at the lowest |t| is at least 1 sigma
BELOW some points at slightly larger |t|. This undesirable feature is reflected in all the GPD data with z!=0 which lead to terrible fit results where it's supposed to be monotonic. You can see how the GPD fits failed in the App C of<span class="x_Apple-converted-space"> </span><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.overleaf.com_7932724842pjgpxkdxnzsf&d=DwMFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=s_6frbucAbPNpyud7LY_-SumKWTgN2yFreR0H8DNLpyLyvbrrhFkRSVhOA1pLzFT&s=betf3IQa9MTAH1jPTcebts8k39yDxzaq7P610iFR0EM&e=" originalsrc="https://www.overleaf.com/7932724842pjgpxkdxnzsf" shash="iwr9jNJr9+usvBF5KqzsO5I5K1QpfbycTZexKizM9Kjnbzr6TUudipafD3lKYZP/c0jtHT1aCpCDf3hYgxaQRPxlMCIEFTGb4QhUJqL7Ml1whGadvojHQhZUdVgVM1oUJKCW4bRQpYZWSC3kb5AhQztqvQhfprwwybqDcwBMEI4=" id="LPNoLPOWALinkPreview">https://www.overleaf.com/7932724842pjgpxkdxnzsf</a></div>
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<span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">There are some things I will do to move on, but please send any suggestions on these fits above or the next directions below.</span></div>
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First,<span class="x_Apple-converted-space"> </span><span class="x_elementToProof x_ContentPasted0" style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">Colin has
given me xi=1 amplitudes which I will begin to look at next. In my notes, I briefly describe how I believe the A_5 amplitude maps to the D term explicitly. Interesting, if true....</span></span></div>
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<span class="x_ContentPasted1" style="background-color:rgb(255,255,255); display:inline!important"><span class="x_ContentPasted2" style="background-color:rgb(255,255,255); display:inline!important">Next,<span class="x_ContentPasted2"> </span></span>Colin has
some xi=0 data with higher pz which I could add to this xi=0 analysis to give better range in nu. I will attempt to get the amplitudes from him. In his famous plot of our data spread in xi and t, there is not a great t coverage at xi=0, so there may not be
much left to do prior to lattice without generating new data to clear up the situation.</span><br>
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Best,</div>
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Joe</div>
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PS: Overleaf is failing when I have too many plots (not quite 100). If I can't look at several dozen plots of data and analysis, is it even science? If you wish to see the appendices where I have each (pf,pi) plotted individually<span class="x_ContentPasted3" style="background-color:rgb(255,255,255); display:inline!important"><span class="x_ContentPasted3"> </span>(or
not see or to fix the too many plots error)<span class="x_ContentPasted3"> </span></span>then you must (un)comment the \iffalse and \if pair which surround the begin{figure} calls.</div>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><span style="font-family:Arial,Helvetica,sans-serif; font-size:small; text-align:start; color:rgb(34,34,34); background-color:rgb(255,255,255); display:inline!important">--</span><br style="font-family:Arial,Helvetica,sans-serif; font-size:small; text-align:start; color:rgb(34,34,34)">
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<div>Joe Karpie</div>
<div>Pronouns: He/His/Him</div>
<div>Postdoctoral Fellow</div>
<div>Theoretical and Computational Physics Center</div>
<div>Jefferson Lab</div>
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<span id="x_cid:B6646762-D757-42CF-95EF-8843D64DFD78"><form_factor.pdf></span><span style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">_______________________________________________</span><br style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">Hadstruct
mailing list</span><br style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<a href="mailto:Hadstruct@jlab.org" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">Hadstruct@jlab.org</a><br style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
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