Transition form factors and helicity amplitudes for electroexcitation of negative and positive parity nucleon resonances in a light-front quark model
| Autor: | Amand Faessler, Thomas Gutsche, Valery E. Lyubovitskij, D. K. Fedorov, Igor T. Obukhovsky |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Quark Particle physics 010308 nuclear & particles physics Nuclear Theory High Energy Physics::Phenomenology Quark model FOS: Physical sciences Resonance Parity (physics) 01 natural sciences Helicity High momentum High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Amplitude 0103 physical sciences High Energy Physics::Experiment Nuclear Experiment 010306 general physics Nucleon |
| Zdroj: | Physical Review |
| Popis: | A workable basis of quark configurations $s^3$, $s^2p$ and $sp^2$ at light front has been constructed to describe the high-$Q^2$ behavior of transition form factors and helicity amplitudes in the electroproduction of the lightest nucleon resonances, $N_{1/2^-}(1535)$ and $N_{1/2^+}(1440)$. High-quality data of the CLAS Collaboration are described in the framework of a model which takes into account mixing of the quark configurations and the hadron-molecular states. The model allows for a rough estimate of the quark core weight in the wave function of the resonance in a comparison with high momentum transfer data on resonance electroproduction. 18 pages |
| Databáze: | OpenAIRE |
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