A covariant formalism for the N* electroproduction at high momentum transfer

Details A covariant formalism for the N* electroproduction at high momentum transfer A covariant formalism for the N* electroproduction at high momentum transfer

2010-08-02

arxiv.org/abs/1008.0371v1

Proceedings of Excusive Reactions and High Momentum Transfer IV, 287 (2011)

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 5 figures, using latex with ws-procs9x6.cls. Presentation at the IV Workshop on Exclusive Reactions at High Momentum

Scientific paper

A constituent quark model based on the spectator formalism is applied to the gamma N -> N* transition for the three cases, where N* is the nucleon, the Delta and the Roper resonance. The model is covariant, and therefore can be used for the predictions at higher four-momentum transfer squared, Q2. The baryons are described as an off-mass-shell quark and a spectator on-mass-shell diquark systems. The quark electromagnetic current is described by quark form factors, which have a form inspired by the vector meson dominance. The valence quark contributions of the model are calibrated by lattice QCD simulations and experimental data. Contributions of the meson cloud to the inelastic processes are explicitly included.

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