Meson and Baryon Electromagnetic Form Factors in a Dyson-Schwinger approach
Zhaoqian Yao
Fri, Jun. 21st 2024, 11:00
Bat 703, p 45, CEA Saclay, Orme des Merisiers

Using Dyson-Schwinger equation (DSE) approach of QCD describing hadron properties, parameter-free predictions are delivered for pion, kaon elastic electromagnetic form factors, $F_{P=pi, K}$, and nucleon elastic electromagnetic form factors $G_{E,M}^N$. Regarding positive-charge states, the analysis stresses that the presence of scaling violations in QCD entails that $Q^2 F_Pleft(Q^2right)$ should exhibit a single maximum on $Q^2>0$. The study predicts that, for charged $pi, K$ mesons, the $Q^2 F_Pleft(Q^2right)$ maximum lies in the neighbourhood $Q^2 simeq 5 mathrm{GeV}^2$. The proton electric form factor, $G_E^p$, possesses a zero, whereas that of the neutron, $G_E^n$, does not. The difference owes to the behavior of the Pauli form factor of the proton's singly-represented valence $d$-quark. Consequently, $G_E^n>G_E^p$ on a material large- $Q^2$ domain. These predictions can be tested in modern experiments.

Contact : Benjamin AUDURIER


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