A Relativistic Coupled-Channel Formalism for Electromagnetic Form Factors of 2-Body Bound States

We discuss a Poincaré invariant coupled-channel formalism which is based on the point-form of relativistic quantum mechanics. Electromagnetic scattering of an electron by a 2-body bound state is treated as a 2-channel problem for a Bakamjian-Thomas-type mass operator. In this way retardation effects...

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Bibliographic Details
Published inFew-body systems Vol. 50; no. 1-4; pp. 435 - 437
Main Authors Biernat, E. P., Klink, W. H., Schweiger, W.
Format Journal Article
LanguageEnglish
Published Vienna Springer Vienna 01.05.2011
Springer Nature B.V
Subjects
Atomic
Electromagnetism
Hadrons
Heavy Ions
Molecular
Nuclear Physics
Optical and Plasma Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum physics
Relativistic Quantum Mechanic
Form Factor
Pion Form Factor
Mass Operator
Electromagnetic Form Factor
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Summary:We discuss a Poincaré invariant coupled-channel formalism which is based on the point-form of relativistic quantum mechanics. Electromagnetic scattering of an electron by a 2-body bound state is treated as a 2-channel problem for a Bakamjian-Thomas-type mass operator. In this way retardation effects in the photon-exchange interaction are fully taken into account. The electromagnetic current of the 2-body bound state is then extracted from the one-photon-exchange optical potential. As an application we calculate electromagnetic pion and deuteron form factors. Wrong cluster properties, inherent in the Bakamjian-Thomas framework, are seen to cause spurious (unphysical) contributions in the current. These are separated and eliminated in an unambiguous way such that one is left with a current that has all the desired properties.
ISSN:0177-7963
1432-5411
DOI:10.1007/s00601-010-0180-y