Место издания:Cornell University, Ithaca N.Y., United States
Первая страница:1
Последняя страница:19
Аннотация:A relativistic light-front quark model is used to describe both the
elastic nucleon and nucleon-Roper transition form factors
in a large $Q^2$ range, up to 35 GeV$^2$ for the
elastic and up to 12 GeV$^2$ for the resonance case. Relativistic
three-quark configurations satisfying the Pauli exclusion principle on the
light-front are used for the derivation of the current matrix elements.
The Roper resonance is considered as a mixed state of a three-quark core
configuration and a molecular $N+\sigma$ hadron component. Based on
this ansatz we obtain a realistic description of both processes, elastic
and inelastic, and show that existing experimental data are indicative of a
composite structure of the Roper resonance.