[Theory-seminars] Theory seminar TODAY at 1pm

[Adam Freese]

Greetings everyone,

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.

The seminar will be given by Wei-Yang Liu from Stony Brook University, and will take place in CC F224-225 and will be broadcast on Zoom at:
https://jlab-org.zoomgov.com/j/1603240384?pwd=h9VVbMsOFm4DTCbirqcbeifU2KhIPI.1

Although this is a Theory Center seminar and not a cake seminar, cake will also be available for in-person participants.

The title and abstract are as follows.

Title: Hadronic Structure Emerged from Topological Vacuum — Buried treasure in the sand of the QCD sea

Abstract:

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.

Kind regards,
Adam
(on behalf of the committee: Adam, Joe and Pia)

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