On the pion cloud of the nucleon

Abstract

We evaluate the two--pion contribution to the nucleon electromagnetic form factors by use of dispersion analysis and chiral perturbation theory. After subtraction of the rho--meson component, we calculate the distributions of charge and magnetization in coordinate space, which can be interpreted as the effects of the pion cloud. We find that the charge distribution of this pion cloud effect peaks at distances of about 0.3 fm. Furthermore, we calculate the contribution of the pion cloud to the isovector charges and radii of the nucleon.

arXiv comment7 pages, latex, 3 ps figures, minor changes

References in corpus (17)

• Chiral Dynamics in Nucleons and Nuclei
• The ratio of proton's electric to magnetic form factors measured by polarization transfer
• Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2
• Dispersion-Theoretical Analysis of the Nucleon Electromagnetic Formfactors
• Aspects of chiral pion-nucleon physics
• Low energy analysis of the nucleon electromagnetic form factors
• A Coherent Interpretation of the Form Factors of the Nucleon in Terms of a Pion Cloud and Constituent Quarks
• The form factors of the nucleon at small momentum transfer
• Baryon form factors in chiral perturbation theory
• Dispersion-theoretical analysis of the nucleon electromagnetic form factors: Inclusion of time-like data
• Cutoff schemes in chiral perturbation theory and the quark mass expansion of the nucleon mass
• Nucleon electroweak form factors: Analysis of their spectral functions
• Extended Gari-Krumpelmann model fits to nucleon electromagnetic form factors
• Muon capture by a proton in heavy baryon chiral perturbation theory
• Electromagnetic form factors of the nucleon in relativistic baryon chiral perturbation theory
• Spectral functions of isoscalar scalar and isovector electromagnetic form factors of the nucleon at two-loop order
• Nucleon electromagnetic structure revisited

Cited by in corpus (31)

• Dispersion analysis of the nucleon form factors including meson continua
• Nucleon electromagnetic form factors
• Electromagnetic Form Factors of the Nucleon and Compton Scattering
• Measurements of the neutron electric to magnetic form factor ratio GEn/GMn via the ^2H(\vec{e},e'\vec{n})^1H reaction to Q^2 = 1.45 (GeV/c)^2
• A pure S-wave covariant model for the nucleon
• Updated dispersion-theoretical analysis of the nucleon electromagnetic form factors
• Octet baryon electromagnetic form factors in nuclear medium
• Electroweak structure of the nucleon, meson cloud and light-cone wavefunctions
• Dispersion-theoretical analysis of the electromagnetic form factors of the nucleon: Past, present and future
• Proton root-mean-square radii and electron scattering
• Octet baryon electromagnetic form factors in a relativistic quark model
• Novel evaluation of the two-pion contribution to the nucleon isovector form factors
• Electromagnetic Transition Form Factors of Baryon Resonances
• No Sommerfeld resummation factor in e+e- -> ppbar ?
• The Role of Mesons in the Electromagnetic Form Factors of the Nucleon
• Quantifying the nucleon's pion cloud with transverse charge densities
• Proton Electromagnetic Form Factor Ratios at Low Q^2
• Realizing vector meson dominance with transverse charge densities
• Nucleon Form Factors in Dispersion Theory
• Theory and Phenomenology of Hadrons
• Axial transition form factors of octet baryons in the perturbative chiral quark model
• Weak interaction axial form factors of the octet baryons in nuclear medium
• Electroweak form factors of baryons in dense nuclear matter
• Transverse densities of octet baryons from chiral effective field theory
• Experiments with polarized 3He at MAMI
• A Potential Model Study of the Nucleon's Charge and Mass Radius
• Quark model calculations of transition form factors at high photon virtualities
• Logarithmic corrections and soft photon phenomenology in the multipole model of the nucleon form factors
• Comparisons of electric charge and axial charge meson cloud distributions in the PCQM
• On the physics behind the form factor ratio ${\mu }_p{G}_E^p(Q^2)/G_M^p(Q^2)$
• Baryon Form Factors