Speaker
Description
In this talk, we will discuss a recent study on the electromagnetic form factor of nucleons from our group. The SU(3) chiral effective field theory is applied to calculate the potential of nucleon anti-nucleon scatterings up to the next-to-leading order. The potentials are then input into the Lippmann-Schwinger equation, and the scattering amplitudes are solved. These potentials are input as the kernel to study the nucleon anti-nucleon FSI. With distorted-wave Born approximation, we study the processes of electron-positron annihilation into nucleon-antinucleon. The separated EMFFs are extracted, and the oscillation of the subtracted formfactors is discussed. An attractive model is proposed and needs further study. We will also discuss the possibility of combining the quark model and chiral effective field theory to describe strong interactions in a wider range.
