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

Session

Session VIII

Oct 10, 2025, 11:00 AM

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

23. Calculation of the fourth Mellin moment of the pion distribution amplitude using the HOPE method

Robert Perry (Massachusetts Institute of Technology)

10/10/25, 11:00 AM

The pion light-cone distribution amplitude (LCDA) is an essential non-perturbative input for a range of high-energy exclusive processes in quantum chromodynamics. Building upon previous work, I will describe the calculation of the fourth Mellin moment of the pion LCDA in the continuum using the heavy-quark operator product expansion (HOPE) method.

27. PDFs from four-point functions on the lattice

Christian Zimmermann (Lawrence Berkeley National Laboratory)

10/10/25, 11:25 AM

Among other approaches developed in recent years, four-point functions provide access to the $x$ dependence of parton distribution functions (PDFs). One of the corresponding methods is often referred to as the lattice cross section (LCS) approach: in this method, hadronic matrix elements of two local quark-bilinears located at equal time are factorized in terms of a PDF and a perturbative...

15. Parton Distributions on a Quantum Computer

Jiunn-Wei Chen (National Taiwan University)

10/10/25, 11:50 AM

We perform the first quantum computation of parton distribution function (PDF) with a real quantum device by calculating the PDF of the lightest positronium in the Schwinger model with IBM quantum computers. The calculation uses 10 qubits for staggered fermions at five spatial sites and one ancillary qubit. The most critical and challenging step is to reduce the number of two-qubit gate depths...

11. Lattice Determination of Parton Distributions Through Neural Network

Min-Huan Chu (Adam Mickiewicz University)

10/10/25, 12:15 PM

We propose a framework for the reconstruction of parton distribution functions (PDFs) and generalized parton distributions (GPDs) from lattice QCD, utilizing artificial neural networks (ANNs). Our approach combines two complementary methodologies: the Large Momentum Effective Theory (LaMET) and the short-distance operator expansion (SDE). To determine ANN-based PDFs and GPDs, we achieve a...