2003/03/31 by J. Friedrich, Th. Walcher · 3 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Charge (physics) #Cloud chamber #Electric charge #Form factor (electronics) #Interpretation (philosophy) #Magnetic form factor #Neutron #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Proton #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #hep-ph
paper · pdf · doi:10.1140/epja/i2003-10025-3
published as Eur.Phys.J.A17:607-623,2003 · 17 pages, 17 figures
arxiv created 2003/04/13 · openalex publication_date 2003/08/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The recent unbiased measurements of the electric form factor of the neutron suggest that its shape may be interpreted as a smooth broad distribution with a bump at Q2 ≈ 0.3(GeV/c)2 superimposed. As a consequence the corresponding charge distribution in the Breit frame shows a negative charge extending as far out as 2fm. It is natural to identify this charge with the pion cloud. This realisation is then used to reanalyse all old and new data of the electric and magnetic from factors of the proton and the neutron by a phenomenological fit and by a fit based on the constituent quark model. It is shown that it is possible to fit all form factors coherently with both ansaetzen and that they all show the signal of the pion cloud.