K\bar{K}-Continuum and Isoscalar Nucleon Form Factors

Abstract

We analyse the isoscalar vector current form factors of the nucleon using dispersion relations. In addition to the usual vector meson poles, we account for the K\bar{K}-continuum contribution by drawing upon a recent analytic continuation of KN scattering amplitudes. For the Pauli form factor all strength in the ϕregion is already given by the continuum contribution, whereas for the Dirac form factor additional strength in the ϕregion is required. The pertinent implications for the leading strangeness moments are demonstrated as well. We derive a reasonable range for the leading moments which is free of assumptions about the asymptotic behavior of the form factors. We also determine the \phiNN coupling constants from the form factor fits and directly from the K\bar{K} -> N\bar{N} partial waves and compare the resulting values.

17 pages, Latex, 1 PS figure included with epsf.sty

Cited by in corpus (25)

• Nucleon Electromagnetic Form Factors
• Dispersion analysis of the nucleon form factors including meson continua
• The Strange Quark Contribution to the Proton's Magnetic Moment
• Precision Measurements of the Nucleon Strange Form Factors at Q^2 ~0.1 GeV^2
• Parity-violating electroweak asymmetry in $\vec{e}p$ scattering
• Evidence for Strange Quark Contributions to the Nucleon's Form Factors at $Q^2$ = 0.108 (GeV/c)${}^2$
• The size of the proton - closing in on the radius puzzle
• Constraints on the Nucleon Strange Form Factors at Q^2 ~ 0.1 GeV^2
• Theoretical Constraints and Systematic Effects in the Determination of the Proton Form Factors
• New insights into the nucleon's electromagnetic structure
• Updated dispersion-theoretical analysis of the nucleon electromagnetic form factors
• High-precision calculation of the strange nucleon electromagnetic form factors
• Nucleon strangeness form factors from N_f=2+1 clover fermion lattice QCD
• Hadron structure at low Q^2
• Parity Violation in Elastic Electron-Nucleon Scattering: Strangeness Content in the Nucleon
• Novel evaluation of the two-pion contribution to the nucleon isovector form factors
• Peripheral transverse densities of the baryon octet from chiral effective field theory and dispersion analysis
• The phi NN coupling from chiral loops
• Form factors and other measures of strangeness in the nucleon
• What Do We Know About the Strange Magnetic Radius?
• Realizing vector meson dominance with transverse charge densities
• Strange nucleon form factors: Solitonic approach to $G_M^s$, $G_E^s$, ${\tilde{G}}_A^p$ and ${\tilde{G}}_A^n$ and comparison with world data
• Nucleon Form Factors in Dispersion Theory
• Chiral constraints on the isoscalar electromagnetic spectral functions of the nucleon from leading order vector meson couplings
• Future Directions in Parity Violation: From Quarks to the Cosmos