Electromagnetic properties of off-shell particles and gauge invariance

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dc.creatorNagorny, S. I.
dc.creatorDieperink, A. E. L.
dc.date1998-03-02
dc.date.accessioned2026-07-07T05:42:20Z
dc.date.available2026-07-07T05:42:20Z
dc.descriptionElectromagnetic properties of off-shell particles are discussed on the basis of a purely electromagnetic reaction: virtual Compton scattering off a proton. It is shown that the definition of off-shell electromagnetic form factors is not gauge invariant and that these cannot be investigated in practice. Using only fundamental requirements of gauge invariance it is demonstrated that off-shell effects are cancelled in the longitudinal components of the total conserved current by the minimal contact current, while the off-shellness appears only in the the transverse (gauge invariant) non-pole part. This provides the possibility to introduce an on-shell extrapolated form factor F_1^+(q^2) in a gauge invariant way for the unphysical time-like region, 4m_e^2<q^2, 4M_N^2.
dc.description27 pages, 1 figure
dc.identifierhttps://arxiv.org/abs/nucl-th/9803007
dc.identifierhttp://arxiv.org/abs/nucl-th/9803007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/82891
dc.subjectNuclear Theory
dc.titleElectromagnetic properties of off-shell particles and gauge invariance
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