Electromagnetic structure of the nucleon and the Roper resonance in a light-front quark approach

Abstract

A relativistic light-front quark model is used to describe both the elastic nucleon and nucleon-Roper transition form factors in a large Q2 range, up to 35 GeV2 for the elastic and up to 12 GeV2 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.

19 pages

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Cited by in corpus (15)

• Baryons as relativistic three-quark bound states
• New Results from the Studies of the $N(1440)1/2^{+}$, $N(1520)3/2^{-}$, and $\Delta (1620)1/2^{-}$ Resonances in Exclusive $ep\to e^{\prime }{p}^{\prime }{\pi }^{+}{\pi }^{-}$ Electroproduction with the CLAS Detector
• Nucleon structure in a light-front quark model consistent with quark counting rules and data
• Electromagnetic Transition Form Factors of Baryon Resonances
• Nucleon resonances with higher spins in soft-wall AdS/QCD
• Recent results on the nucleon resonance spectrum and structure from the CLAS detector
• Valence quark contributions for the ${\gamma }^{\ast }N\to N(1440)$ form factors from Light-Front holography
• Transition form factors and helicity amplitudes for electroexcitation of negative- and positive parity nucleon resonances in a light-front quark model
• Semiexclusive production of $J/\psi$ mesons in proton-proton collisions with electromagnetic and diffractive dissociation of one of the protons
• $\gamma N\to N^{\ast }(1535)$ transition in soft-wall AdS/QCD
• The Roper resonance: a genuine quark state or a dynamically generated structure?
• Low-$Q^2$ empirical parametrizations of the $N^{\ast }$ helicity amplitudes
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• Updates on the Studies of $N^{\ast }$ Structure with CLAS and the Prospects with CLAS12
• Quark model study of the $\pi N\to \pi N$ reactions up to the $N(1440)$ resonance region