The anapole moments of hydrogenic atoms

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Abstract
P-violating but T-invariant electron-nucleon forces in the atom give rise to static, local multipole moments. The lowest of these is the anapole moment which is of rank one and has a toroidal magnetic field distribution. The authors discuss the detailed form of the static electromagnetic fields due to the P-violating anapole moment of a non-degenerate quantum mechanical system such as an atom. They calculate both relativistically and non-relativistically the anapole moment of the ground state of atomic hydrogen which is induced by the P-violating electroweak interaction. They list the standard model values for a number of hydrogenic systems.