Hadron structure in the light-front dynamics

Speaker: Yongwoo Choi (Inha University, Korea)
Date & time: 11 am KST, September 21, 2022
Place: Online (Zoom)

To probe point-like particles inside nucleon, an incident lepton with extremely high energy is required. It can be described by the fast-moving target frame, namely the infinite momentum frame. Since the equivalence between the infinite momentum frame and light-front dynamics is well known, the light-front dynamics play a significant role in understanding the hadron structure. Especially, the twist expansion is well defined on the light-front coordinates, and light-front time-ordered amplitudes are invariant under the z-direction Lorentz boost, which provides the Fock space expansion with a trivial vacuum.

In this talk, we show the basic formulation of light-front field theory and discuss elastic scattering and virtual meson production using the light-front quark model in a scalar field theory. From each process, we can obtain the electromagnetic form factor and Compton form factor. In addition, we can investigate the deeply virtual scattering using the leading twist, it provides consistent results and the sum rules between the generalized parton distribution, parton distribution function, and electromagnetic form factor.