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Electromagnetic structure of the nucleon and the Roper resonance in a light-front quark approachстатья
- Авторы: Obukhovsky I.T., Faessler A., Gutsche Th, Lyubovitskij V.E.
- Сборник: ArXiv.org e-Print
- Серия: arXiv.1306.3864v1[hep-ph]
- Том: 1306
- Год издания: 2013
- 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.
- Добавил в систему: Обуховский Игорь Тимофеевич