Tuesday, April 23rd, 3:30PM (in-person and on zoom)

Dr. Joseph Karpie (Jefferson Lab)

Host: Dimitra Pefkou

"Calculating what you're made of: Partons and the Lattice"

Many interactions with nuclei can be described in terms of convolutions of universal parton distributions. These parton distributions describe the way quarks and gluons distribute themselves within the hadrons in terms of their fraction of the total momentum. Over the past decade these distributions have been inferred from matrix elements calculated with Lattice QCD in analogous methods to those used for experiment. From these data the evolution of the parton distributions can also be determined independent of a PDF analysis. Also, the Lattice QCD matrix elements can be included as prior information in global analysis of experimental cross sections leading to significantly improved understanding of the structure in a wide range of the momentum fraction.

Tuesday, April 30th, 3:30PM (in-person and on zoom)

Dr. Daniel Hackett (Fermilab)

Host: Dimitra Pefkou

"Machine-learned flows for QCD"

Abstract coming soon!

Tuesday, May 7th, 3:30PM (in-person and on zoom)

Zhiquan Sun (MIT)

Host: Dimitra Pefkou

Title and abstract coming soon!

Tuesday, May 28th, 3:30PM (in-person and on zoom)

Meijian Li (Santiago de Compostela Univeersity)

Host: Xin-Nian Wang

"Scattering and gluon emission of a dressed quark in colored field"

Following the non-perturbative light-front Hamiltonian formalism developed in the preceding works [Phys. Rev. D 104, 056014 (2021), Phys. Rev. D 108, 036016 (2023)], we investigate the scattering and gluon emission of dressed quark states inside a SU(3) colored background field. We consider the scenario in deep inelastic scattering and in heavy ion collisions, where the quark originates from far outside the background field and is described by the light-front wavefunction of the QCD eigenstate in the |q>+|qg> Fock space. We perform numerical simulations of the real-time quantum state evolution of an initially dressed quark state at various energy and medium configurations. With the obtained light-front wavefunction of the evolved state, we extract the quark jet transverse momentum distribution, the cross section, and the gluon emission rate. This investigation provides a novel systematic description of the quark scattering process inside colored medium using a non-perturbative formalism.

Tuesday, June 4th, 3:30PM (on zoom)

Chun Shen (Wayne State University)

Host: Wenbin Zhao

Title and abstract coming soon!