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Transition form factors: $\gamma^\ast + p \to \Delta(1232)$, $\Delta(1600)$ by Lu, Ya; Chen, Chen; Cui, Zhu-Fang; Roberts, Craig D.; Schmidt, Sebastian M.; Segovia, Jorge; Zong, Hong-Shi is a scholarly article available to read on EtoBox.

What is Transition form factors: $\gamma^\ast + p \to \Delta(1232)$, $\Delta(1600)$ about?

Electroproduction form factors describing the $\gamma^\ast p \to \Delta^+(1232), \Delta^+(1600)$ transitions are computed using a fully-dynamical diquark-quark approximation to the Poincar\'e-covariant three-body bound-state problem in relativistic quantum field theory. In this approach, the $\Delta(1600)$ is an analogue of the Roper resonance in the nucleon sector, appearing as the simplest radial excitation of the $\Delta(1232)$. Precise measurements of the $\gamma^\ast p \to \Delta^+(1232)$ transition already exist on $0 \leq Q^2 \lesssim 8\,$GeV$^2$ and the calculated results compare favourably with the data outside the meson-cloud domain. The predictions for the $\gamma^\ast p \to \Delta^+(1600)$ magnetic dipole and electric quadrupole transition form factors are consistent with the empirical values at the real photon point, and extend to $Q^2 \approx 6 m_p^2$, enabling a meaningful direct comparison with experiment once analysis of existing data is completed. In both cases, the electric quadrupole form factor is particularly sensitive to deformation of the $\Delta$-baryons. Interestingly, whilst the $\gamma^\ast p \to \Delta^+(1232)$ transition form factors are larger in magn

Author

Lu, Ya; Chen, Chen; Cui, Zhu-Fang; Roberts, Craig D.; Schmidt, Sebastian M.; Segovia, Jorge; Zong, Hong-Shi

Published

2019

Language

EN