Electromagnetic currents for dressed hadrons

Haberzettl, Helmut

doi:10.1103/physrevd.99.016022

Electromagnetic currents for dressed hadrons

Journal Article · Thu Jan 31 00:00:00 EST 2019 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.99.016022· OSTI ID:1612662

Haberzettl, Helmut ^[1]

George Washington Univ., Washington, DC (United States); DOE/OSTI

We propose an extension of the minimal-substitution prescription for coupling the electromagnetic field to hadronic systems with internal structure. The resulting rules of extended substitution necessarily distinguish between couplings to scalar and Dirac particles. Moreover, they allow for the incorporation of electromagnetic form factors for virtual photons in an effective phenomenological framework. Applied to pions and nucleons, assumed to be fully dressed to all orders, the resulting dressed currents are shown to be locally gauge invariant. Moreover, half-on-shell expressions of (hadron propagator)×(electromagnetic current) needed in all descriptions of physical processes will lose all information about hadronic dressing for real photons. The Ball-Chiu ansatz for the spin-1/2 current is seen to suffer from an incomplete coupling procedure where some essential aspects of the Dirac particle are effectively treated as those of a scalar particle. Applied to real Compton scattering on pions and nucleons, we find that all dressing information cancels exactly when external hadrons are on shell, leaving only gauge-invariant bare Born-type contributions with physical masses. Furthermore, nontrivial descriptions necessarily require contact-type two-photon processes obtained by hadrons looping around two photon insertion points.

View Accepted Manuscript (DOE)

Research Organization:: George Washington Univ., Washington, DC (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0016582

OSTI ID:: 1612662

Alternate ID(s):: OSTI ID: 1493086

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 1 Vol. 99; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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