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<span style="font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="background-color: rgb(255, 255, 255); font-family: Calibri, Helvetica, sans-serif; color: rgb(0, 0, 0);">Hello All,</span></span>
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<div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><span style="font-family:Calibri,Helvetica,sans-serif">This coming Monday, February 14th at 1:00PM (EST), </span><span style="font-family:Calibri,Helvetica,sans-serif"><span class="field-content"><strong></strong>Feng
Yuan</span> will give a (virtual) theory seminar on: </span><a href="https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="0"><span style="font-family:Calibri,Helvetica,sans-serif">https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09</span></a><br>
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<div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><span style="font-family:Calibri,Helvetica,sans-serif">Please see below for the title and abstract of
</span><span class="x_field-content" style="font-family:Calibri,Helvetica,sans-serif">Feng's talk.</span><br>
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<div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><b><span style="font-family:Calibri,Helvetica,sans-serif"><u>Theory Seminar</u></span></b></div>
<div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><span style="font-family:Calibri,Helvetica,sans-serif">Monday, February 14th at 1:00PM</span></div>
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<span class="x_field-content" style="font-family:Calibri,Helvetica,sans-serif"><u><b>Feng Yuan</b></u> (<span class="field-content">Lawrence Berkeley National Lab</span>)</span></div>
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<span class="x_field-content" style="font-family:Calibri,Helvetica,sans-serif">will speak about
</span><span class="x_field-content"><span style="color: black; font-family: Calibri, Helvetica, sans-serif;">"</span></span><span class="x_field-content" style="font-family:Calibri,Helvetica,sans-serif">Near Threshold Heavy Quarkonium Photoproduction"</span><span class="x_field-content"><br>
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<div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><u><b><span style="font-family:Calibri,Helvetica,sans-serif">Abstract:</span></b></u></div>
<div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);">There has been a claim in the literature that the near threshold photo-production of heavy quarkonium can measure the gravitational form factors and hence to directly measure the proton
mass distribution. In this talk, we will present our recent analysis based on perturbative QCD calculations for this process at large momentum transfer. We take into account the contributions from the leading three-quark Fock states of the nucleon. The dominant
contribution comes from the three-quark Fock state with one unit quark orbital angular momentum (OAM) whereas that from zero quark OAM is suppressed at the threshold. From our analysis, we also show that there is no direct connection between the near threshold
heavy quarkonium photoproduction and the gluonic gravitational form factors of the nucleon without additional approximation. Based on the comparison between our result and recent GlueX data of $J/\psi$ photoproduction, we make predictions for $\psi'$ and $\Upsilon$
(1S,2S) states which can be tested in future experiments.<br>
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<div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><span style="font-family:Calibri,Helvetica,sans-serif">Have a pleasant weekend!</span></div>
<span style="background-color: rgb(255, 255, 255); font-family: Calibri, Helvetica, sans-serif; color: rgb(0, 0, 0);">Caroline, Colin & Patrick</span></div>
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