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Greetings everyone,</div>
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Apologies for the late reminder, but we have our Theory Center seminar TODAY at 1pm. The Monday seminar was delayed due to the emergency weather closure on Monday.</div>
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<div style="font-size: 12pt;" class="elementToProof"><span style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; color: rgb(0, 0, 0);">The seminar will be given by
</span><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; color: black;">Wei-Yang Liu from Stony Brook University, and will</span><span style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; color: rgb(0, 0, 0);"> take
place in CC F224-225 and will be broadcast on Zoom at:<br>
<a href="https://jlab-org.zoomgov.com/j/1603240384?pwd=h9VVbMsOFm4DTCbirqcbeifU2KhIPI.1">https://jlab-org.zoomgov.com/j/1603240384?pwd=h9VVbMsOFm4DTCbirqcbeifU2KhIPI.1</a><br>
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Although this is a Theory Center seminar and not a cake seminar, cake will also be available for in-person participants. </div>
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The title and abstract are as follows.</div>
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Title: Hadronic Structure Emerged from Topological Vacuum — Buried treasure in the sand of the QCD sea</div>
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Abstract: </div>
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We develop an effective theory based on the low resolution structure of the QCD vacuum aligned with the gradient flow renormalization scheme where the QCD ensemble is modeled as a dilute liquid of instantons and anti-instantons with sea quarks hopping around
those topological gauge field configurations. With this picture, we construct a systematic density expansion with diagrammatic Feynman rules to nonperturbatively evaluate vacuum correlation functions, and hadron matrix elements (form factors) of light hadrons.
As a proof of principle, we compute the gluonic scalar, gravitational form factors, and C-odd three gluon operators to reveal the gluonic structure of hadrons. We also further apply the resulting form factors to analyze the gluon dominance in quarkonium photo-production
near the threshold. The results are in good agreement with current experiments and recent lattice QCD results, demonstrating that semiclassical vacuum theory provides a robust nonperturbative framework for quantitative predictions with clear physical interpretation
for hadron structure.</div>
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Kind regards,</div>
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Adam<br>
(on behalf of the committee: Adam, Joe and Pia)</div>
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