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SUMMARY:QCD Vacuum-Based Framework for Light-Front Dynamics and Parton Str
 ucture
DTSTART:20260805T130000Z
DTEND:20260805T143000Z
DTSTAMP:20260729T230200Z
UID:indico-event-62@indico.onium.cc
DESCRIPTION:Speakers: Weiyang Liu (Stony Brook U)\n\nAt Bjorken limit\, li
 ght-cone correlators dominate hadron structure in high-energy collisions. 
 Light-front dynamics (LFD) thus provides a natural language describing had
 ron structure in terms of partonic degrees of freedom. However\, direct li
 ght-front quantization (LFQ) leads to severe infrared singularities induce
 d by zero modes. These divergences reflect the absence of an intrinsic IR 
 scale and nontrivial vacuum structure\, thus placing QCD at a kinematical 
 critical point. As a result\, a well-defined partonic description requires
  the infrared vacuum structure to be properly renormalized and clearly spe
 cified before taking the infinite-momentum limit. To address this\, we mod
 el the QCD vacuum using instanton liquid ensemble (ILE). In ILE\, nonlocal
  interactions for light quarks emerge from semiclassical gauge field confi
 gurations in Euclidean space. By analytical continuation back to light-con
 e signature\, QCD vacuum-based wave functions obtained by Bethe-Salpeter-F
 addeev equation can be connected to light-front wave functions. This frame
 work allows one to construct parton observables\, including distribution a
 mplitudes (DAs)\, parton distribution functions (PDFs)\, and transverse-mo
 mentum-dependent distributions (TMDs) for light mesons and nucleons from Q
 CD vacuum at a medium renormalization scale. To connect these mid-resoluti
 on quantities to high-energy phenomenology\, the appropriate renormalizati
 on-group evolution must be implemented\, including ERBL\, DGLAP\, and CSS 
 evolution\, which can also can be calculated within the same ILE framework
  in a self-contained manner. The results show good agreement with global a
 nalysis and lattice QCD calculations. Therefore\, we provide a promising f
 ramework for reliable predictions for future measurements and a clean pict
 ure in which light-front parton structure emerges from topological QCD vac
 uum\, bridging nonperturbative vacuum physics with measurable partonic obs
 ervables.\n \n=============\nhttps://zoom.us/j/98684504208?pwd=colk7PaQUv
 7btR4t0uAFs6Nnaf34l5.1\nZOOM ID: 986 8450 4208PW: 488530\n\nhttps://indico
 .onium.cc/event/62/
URL:https://indico.onium.cc/event/62/
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