6533b81ffe1ef96bd1278fef
RESEARCH PRODUCT
On the pion cloud of the nucleon
Ulf-g. MeißnerUlf-g. MeißnerDieter DrechselHans-werner Hammersubject
Nuclear and High Energy PhysicsParticle physicsChiral perturbation theoryNuclear Theorydispersion relationHigh Energy Physics::LatticeisovectorNuclear Theorychiral [perturbation theory]FOS: Physical sciencestwo-pion [effect]form factor [nucleon]density [charge]Nuclear physicsNuclear Theory (nucl-th)PionHigh Energy Physics - Phenomenology (hep-ph)ddc:530Perturbation theoryCoordinate spacenumerical calculationsNuclear ExperimentPhysicsIsovectorpole [rho(770)]Charge densityCharge (physics)High Energy Physics - Phenomenologycloud [pi]High Energy Physics::Experimentspectral representationNucleondescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-10-20 |