Nucleon to $\Delta$ transition form factors and empirical transverse charge densities

Abstract

We investigate the nucleon to $\Delta$ transition form factors in a soft-wall AdS/QCD model and a light-front quark-diquark model inspired by AdS/QCD. From the transition form factors we evaluate the transition charge densities which influences the nucleon to $\Delta$ excitation. Here we consider both the unpolarized and the transversely polarized cases. The AdS/QCD predictions are compared with available experimental data and with the results of the global parameterization, MAID2007.Comment: 9 pages, 5 figures; minor text modified, version to appear in Eur. Phys. J.