Low-energy interaction of composite spin-half systems with scalar and vector fields
D. R. Phillips, M. C. Birse, S. J. Wallace
Abstract
We consider a composite spin-half particle moving in spatially-varying scalar and vector fields. The vector field is assumed to couple to a conserved charge, but no assumption is made about either the structure of the composite or its coupling to the scalar field. A general form for the piece of the spin-orbit interaction of the composite with the scalar and vector fields which is first-order in momentum transfer Q and second-order in the fields is derived.
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