Low energy theorem for scalar and vector interactions of a composite spin-1/2 system

Details Low energy theorem for scalar and vector interactions of a composite spin-1/2 system Low energy theorem for scalar and vector interactions of a composite spin-1/2 system

1994-07-27

arxiv.org/abs/nucl-th/9407040v1

Phys.Rev.Lett. 74 (1995) 228-230

Physics

Nuclear Physics

Nuclear Theory

4 pages

Scientific paper

10.1103/PhysRevLett.74.228

Scalar and vector interactions, with the scalar interaction coupled to a composite spin-1/2 system so as to cause a shift of its mass, are shown to obey a low-energy theorem which guarantees that the second order interaction due to z-graphs is the same as for a point Dirac particle. Off-shell and contact interactions appropriate to the composite system cancel and this is verified in a model of a composite fermion. The result provides a justification for the use of the Dirac equation as it has been in relativistic nuclear scattering and mean field theories.

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