Gauging the spectator equations

Details Gauging the spectator equations Gauging the spectator equations

1997-06-22

arxiv.org/abs/nucl-th/9706051v2

Phys.Rev.C56:2963-2972,1997

Physics

Nuclear Physics

Nuclear Theory

17 pages, REVTeX, epsf, 1 Postscript figure

Scientific paper

10.1103/PhysRevC.56.2963

We show how to derive relativistic, unitary, gauge invariant, and charge conserving three-dimensional scattering equations for a system of hadrons interacting with an electromagnetic field. In the method proposed, the spectator equations describing the strong interactions of the hadrons are gauged using our recently introduced gauging of equations method. A key ingredient in our model is the on-mass-shell particle propagator. We discuss how to gauge this on-mass-shell propagator so that both the Ward-Takahashi and Ward identities are satisfied. We then demonstrate our gauging procedure by deriving the gauge-invariant three-dimensional expression for the deuteron photodisintegration amplitude within the spectator approach.

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