26th International Symposium on Spin Physics (SPIN2025)

Probing Meson Structure via Lattice QCD: EMFF at high $Q^2$ and GPD

Not scheduled

3h 30m

Oral Three-dimensional structure of the nucleon: generalized parton distributions and form factors Parallel

Speaker

Heng-Tong Ding (Central China Normal University)

Description

We present lattice QCD computations addressing crucial aspects of meson internal structure through electromagnetic form factors (EMFFs) and generalized parton distributions (GPDs). Utilizing physical masses and fine lattices, we calculate pion and kaon EMFFs at momentum transfers up to approximately 10 and 28 GeV$^2$, respectively, achieving good agreement with available experimental data at low momentum transfers and providing essential ab-initio benchmarks for upcoming high-energy experiments. Additionally, we compute the x-dependent valence pion GPDs at zero skewness across various momentum transfers by employing advanced renormalization and matching schemes, and also deliver a three-dimensional image of the pion structure in impact-parameter space.

The talk is based on
[1] H.T.Ding, X.Gao, A.D.Hanlon et al., Phys.Rev.Lett. 133 (2024) 18, 181902
[2] H.T.Ding, X.Gao, S.Mukherjee et et al., JHEP 02(2025)056