Phys. Rev. Lett. 74, 228–230 (1995)Low-Energy Theorem for Scalar and Vector Interactions of a Composite Spin-½ SystemReceived 27 July 1994; published in the issue dated 9 January 1995 Scalar and vector interactions, with the scalar interaction coupled to a composite spin-½ 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 suggests a justification for the use of the Dirac equation as it has been used in relativistic nuclear scattering and mean field theories. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.228
DOI:
10.1103/PhysRevLett.74.228
PACS:
24.10.Jv
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