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<div><span class="elementToProof" style="font-size: 12pt; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; line-height: 1.5; color: rgb(0, 0, 0);"><span style="font-size: 15px; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; color: black; background-color: rgb(255, 255, 255);"><span class="ContentPasted0" style="font-size:11pt;margin:0px">Dear
all, </span></span></span></span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; color: black; background-color: rgb(255, 255, 255);"><span style="font-size: 11pt; font-family: Calibri, sans-serif; margin: 0px; color: rgb(36, 36, 36);"><br class="ContentPasted0">
</span></span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; color: black; background-color: rgb(255, 255, 255);"><span class="ContentPasted0" style="font-size: 11pt; font-family: Calibri, sans-serif; margin: 0px; color: rgb(36, 36, 36);">Tomorrow,
at 1pm EDT, we will have a<span class="ContentPasted0"> </span></span><span class="ContentPasted0" style="font-size: 11pt; margin: 0px; display: inline !important; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">hybrid seminar given by Eric Moffat
of Argonne National Lab <span class="x_ContentPasted2 ContentPasted0" style="font-family: Calibri, sans-serif; margin: 0px; display: inline !important; color: rgb(66, 66, 66); background-color: rgb(255, 255, 255);">in the CEBAF Center Auditorium and</span></span><span style="font-size: 11pt; margin: 0px; background-color: white;"></span><span class="ContentPasted0" style="font-size: 11pt; font-family: Calibri, sans-serif; margin: 0px; color: rgb(36, 36, 36);"><span class="ContentPasted0" style="margin:0px"> </span>on
the <span class="x_ContentPasted3 ContentPasted0" style="margin: 0px; display: inline !important; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">following</span><span class="ContentPasted0"> </span>Zoom for Government link:<span class="ContentPasted0" style="margin:0px"> </span></span></span><br class="x_Apple-interchange-newline ContentPasted0" style="font-size: 15px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);">
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<a href="https://jlab-org.zoomgov.com/j/1609875070?pwd=dndhY3paSmRRZ1RTQndtTEwxaWZOdz09" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="0" id="OWA45cdae26-5b74-9d08-4680-a81652b10298" class="x_OWAAutoLink x_ContentPasted4 ContentPasted0" data-outlook-id="c4d30313-11d8-4f7f-aa00-6338143e22d6" style="font-family: Calibri, sans-serif; margin: 0px; outline: 0px; color: rgb(0, 120, 212); background-color: rgb(255, 255, 255);"><span style="font-size:11pt;margin:0px">https://jlab-org.zoomgov.com/j/1609875070?pwd=dndhY3paSmRRZ1RTQndtTEwxaWZOdz09</span></a></div>
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<p class="x_MsoNormal ContentPasted0" style="margin-top:0px;margin-bottom:0px">Also, sign up the spreadsheet we have made in case you’d like to<span> </span><span data-markjs="true" class="markq92ulnaac ContentPasted0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">meet</span><span> </span><span data-markjs="true" class="markpdk1fvxhx ContentPasted0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">with</span><span> </span>him
individually. <span style="font-size: 12pt;">Here is the link:</span><span style="font-size: 12pt;"> </span><a href="https://docs.google.com/spreadsheets/d/1MXdfZORfl_XhBaYzVeNK_tFMzAEB6LOJVbrbiCPa7Ck/edit?usp=sharing" id="LPlnkOWALinkPreview" class="OWAAutoLink" data-outlook-id="72587d6d-2368-4292-98d8-7f1de815e0f3" data-linkindex="0" style="font-size: 12pt;">https://docs.google.com/spreadsheets/d/1MXdfZORfl_XhBaYzVeNK_tFMzAEB6LOJVbrbiCPa7Ck/edit?usp=sharing</a></p>
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<span style="font-size: 15px; font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; color: black; background-color: rgb(255, 255, 255);"><span class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px">Please see below for the title
and abstract of Eric's seminar.</span></span><span style="display: inline !important; background-color: rgb(255, 255, 255);"></span>
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<u style="font-weight:bold"><span style="font-size:12pt;margin:0px"><span data-markjs="true" class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px">Theory</span></span><span style="margin:0px"><span class="x_ContentPasted1 ContentPasted1" style="margin:0px"> </span></span><span style="font-size:12pt;margin:0px"><span data-markjs="true" class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px">Seminar</span></span></u><span class="x_ContentPasted1" style="margin:0px"><span class="x_ContentPasted1 ContentPasted1" style="margin:0px">:</span><b class="ContentPasted1"> </b></span><span class="x_ContentPasted1 ContentPasted1" style="margin:0px">Monday<span class="ContentPasted1"> </span><span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; background-color: rgb(255, 255, 255);"><span class="x_ContentPasted0 x_ContentPasted5 ContentPasted1" style="font-size: 11pt; margin: 0px; display: inline !important; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">October
16</span></span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; background-color: rgb(255, 255, 255);"><sup class="x_ContentPasted0 x_ContentPasted5 ContentPasted1" style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">th</sup></span></span><span class="x_ContentPasted1 ContentPasted1" style="margin:0px">,
1pm EDT (<span class="ContentPasted1" style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; display: inline !important; background-color: rgb(255, 255, 255);">hybrid</span>)</span></p>
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<b><u><span class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px">Speaker</span></u></b><span class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px">:<span class="x_ContentPasted1 ContentPasted1" style="margin:0px"> </span><span data-markjs="true" style="margin:0px"></span><span data-markjs="true" class="x_ContentPasted1" style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;"></span><span class="ContentPasted1" style="margin: 0px; display: inline !important; background-color: rgb(255, 255, 255);">Eric
Moffat</span><span data-markjs="true" class="x_ContentPasted1" style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;"></span><span data-markjs="true" style="margin:0px"></span><span class="x_ContentPasted1 ContentPasted1" style="margin:0px"> </span>(<span class="x_ContentPasted1" style="margin: 0px; color: black; background-color: white;"><span class="ContentPasted1" style="font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; display: inline !important; background-color: rgb(255, 255, 255);">Argonne
National Lab</span></span>) </span></p>
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<b style="font-size:11pt"><span style="margin: 0px; color: black;"><b style="font-size: 13.32px; color: rgb(36, 36, 36);"><u><span style="font-size:11pt;margin:0px"><br class="x_ContentPasted1 ContentPasted1">
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<b style="font-size:11pt"><span style="margin: 0px; color: black;"><b style="font-size: 13.32px; color: rgb(36, 36, 36);"><u><span class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px">Title</span></u></b><span class="x_ContentPasted1 ContentPasted1" style="font-weight: 400; margin: 0px; color: rgb(36, 36, 36);">:</span></span><span style="font-size: 12pt; margin: 0px; color: black;"><span class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px"> </span></span></b><span class="ContentPasted1" style="font-weight: normal; font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">Shedding
light on shadow generalized parton distributions </span></p>
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<b><span style="margin: 0px; color: black;"><b style="font-size: 13.32px; color: rgb(36, 36, 36);"><u><span style="font-size:11pt;margin:0px"><br class="x_ContentPasted1 ContentPasted1">
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<b><span style="margin: 0px; color: black;"><b style="font-size: 13.32px; color: rgb(36, 36, 36);"><u><span class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px">Abstract</span></u></b><span class="x_ContentPasted1 ContentPasted1" style="font-weight: 400; margin: 0px; color: rgb(36, 36, 36);">:</span></span></b><span style="font-size: 12pt; margin: 0px; color: black;"><span class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px"> <span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;">The
feasibility of extracting generalized parton distributions (GPDs) from deeply virtual Compton scattering (DVCS) data has recently been questioned because of the existence of an infinite set of so-called “shadow GPDs” (SGPDs). These SGPDs depend on the process
and manifest as multiple solutions (at a fixed scale </span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">Q2</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;">)
to the inverse problem that needs to be solved to infer GPDs from DVCS data. SGPDs therefore pose a significant challenge for extracting GPDs from DVCS data. With this motivation we study the extent to which QCD evolution can provide constraints on SGPDs.
This is possible because the known classes of SGPDs begin to contribute to observables after evolution, and can then be constrained (at the input scale </span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">Q02</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;">)
by data that has a finite </span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">Q2</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;"> range.
The impact that SGPDs could have on determining the total angular momentum, pressure and sheer force distributions, and tomography is also discussed. We find that </span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">Q2</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;"> evolution,
given empirical data over a wide range of skewness (</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">î</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;">)
and </span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">Q2</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;"> scales,
constrains the SGPDs studied at low </span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">x</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;"> and
low </span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">î</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;">.
If this finding generalizes to all SGPDs—and we have not been able to find any SGPDs with qualitatively different behavior—then this potentially makes extraction of GPDs from DVCS possible over a limited range of </span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">x</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;"> and </span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black;">î</span></span><span style="font-size: 16px; font-family: "Times New Roman", serif; margin: 0px; color: rgb(36, 36, 36); background-color: rgb(255, 255, 255);"><span class="x_ContentPasted6 ContentPasted1" style="font-size: 11pt; font-family: Calibri, Helvetica, sans-serif; margin: 0px; color: black; background-color: white;">. </span></span><span style="font-size: 16px; margin: 0px; background-color: rgb(255, 255, 255);"><br class="x_ContentPasted6 ContentPasted1">
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<span class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px">See you tomorrow. </span></p>
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<span class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px">Best regards, </span></p>
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<span class="x_ContentPasted1 ContentPasted1" style="font-size:11pt;margin:0px">Caroline, Joe, and Zheng-Yang</span></p>
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