XIIth Meeting on Lattice Parton Physics from Large Momentum Effective Theory (LaMET 2025)

Session

Session IV

Oct 9, 2025, 9:00 AM

CFNS, Peter Paul Seminar Room, C 120 Physics Building (Stony Brook University/Online)

20. Ill-Posedness in Limited Discrete Fourier Inversion for Quasi Distributions in LaMET

Ao-Sheng Xiong (Lanzhou University)

10/9/25, 9:00 AM

We systematically investigated the inverse discrete Fourier transform of quasi-distributions from the perspective of inverse problem theory. Mathematically, we have demonstrated that this transformation satisfies two of Hadamard’s well-posedness criteria, existence and uniqueness of the solution, but critically violates the stability requirement. To address this instability, we employed and...

13. The use of gradient flow in LaMET

Jialu Zhang (Shanghai Jiao Tong University)

10/9/25, 9:20 AM

The gradient flow has emerged as a powerful tool to enhance the Large Momentum Effective Theory (LaMET) program, offering both conceptual and practical advantages in lattice QCD studies of hadronic structure. In this report, I present our recent progress in applying the gradient flow to baryon light-cone distribution amplitudes (LCDAs) and quasi-parton distribution functions (quasi-PDFs). For...

5. Regularization Prescription for the Mixing Between Nonlocal Gluon and Quark Operators

Zhuoyi Pang

10/9/25, 9:40 AM

It is well-known that in the study of mixing between nonlocal gluon and quark bilinear operators there exists an ambiguity when relating coordinate space and momentum space results, which can be conveniently resolved through Mellin moments matching in both spaces. In this work, we show that this ambiguity is due to the lack of a proper regularization prescription of the singularity that arises...

32. Bjorken and threshold limits of a quasi-PDF-like structure function in the 2D large-N Gross-Neveu model

Yizhuang Liu (Jagiellonian University)

10/9/25, 10:05 AM

In this talk, we will present the exact expansions at the next-to-leading order in the $1/N$ expansion for a space-like structure function in the 2D large-N Gross-Neveu model, in the Bjorken and the threshold limits.

The space-like structure function is similar to the lattice-calculable quasi-PDFs. As such, the exact expansion in the Bjorken limit allows a non-trivial first principle...