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Sorry everyone, I made a mistake. Wei-Yang Liu's affiliation is Stony Brook U .</div>
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Best,</div>
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Joe</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Theory-seminars <theory-seminars-bounces@jlab.org> on behalf of Joseph Karpie via Theory-seminars <theory-seminars@jlab.org><br>
<b>Sent:</b> Tuesday, January 27, 2026 10:42 AM<br>
<b>To:</b> Adam Freese via Theory-seminars <theory-seminars@jlab.org><br>
<b>Subject:</b> [Theory-seminars] Theory Seminar Wednesday</font>
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Hey everyone,</div>
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Please join us tomorrow (Wednesday) at 1pm in F224-225 for a seminar by Wei-Yang Liu (UConn). </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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<span style="background-color:rgb(255,255,255)">--</span></div>
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Joe Karpie</div>
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Pronouns: He/His/Him</div>
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Postdoctoral Fellow</div>
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Theoretical and Computational Physics Center</div>
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Jefferson Lab</div>
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