The Pion-Cloud Contribution to the Electromagnetic Nucleon Form Factors

Abstract

We study the electromagnetic structure of the nucleon within a hybrid constituent-quark model that comprises, in addition to the $3q$ valence component, also a $3q$+$\pi$ non-valence component. To this aim we employ a Poincaré-invariant multichannel formulation based on the point-form of relativistic quantum mechanics. With a simple 3-quark wave function for the bare nucleon, i.e. the $3q$-component, we obtain reasonable results for the nucleon form factors and predict the meson-cloud contribution to be significant only below $Q^2\lesssim 0.5$\,GeV${}^2$ amounting to about 10\% for $Q^2\to 0$, in accordance with the findings of other authors.

Contribution presented by W. Schweiger at the 21st International Conference on Few-Body Problems in Physics, Chicago IL, May 18-22, 2015; 4 pages, 2 figures

References in corpus (5)

• Electroweak structure of the nucleon, meson cloud and light-cone wavefunctions
• Electromagnetic rho-meson form factors in point-form relativistic quantum mechanics
• Point-Form Hamiltonian Dynamics and Applications
• Electroweak form factors of heavy-light mesons -- a relativistic point-form approach
• Meson-cloud effects in the electromagnetic nucleon structure

Cited by in corpus (2)

• Weak transition form factors of heavy-light pseudoscalar mesons for space- and timelike momentum transfers
• Constituent-quark model with pionic contributions: electromagnetic $N\to \Delta$ transition