OBSERVABILITY OF THE ANAPOLE MOMENT AND NEUTRINO CHARGE RADIUS

Publication Date

1991

Journal or Book Title

PHYSICAL REVIEW D

Abstract

The properties of the neutrino charge radius (NCR) and anapole moments (AM's) of elementary fermions, nucleons, and nuclei are discussed. The dependence of these off-shell electromagnetic couplings on the weak gauge parameter is explicitly demonstrated by a calculation performed in the Rξ gauge. The gauge dependence of the AM's and NCR implies that they cannot be observed in isolation from other second-order, electroweak effects. It is shown, however, that the AM's of various hadronic systems having an SU(2)L quantum number T3L=0 can be considered "observables" in certain formal, though unphysical, limits. It is argued that, apart from these special limits, the AM is a physically meaningful entity only for heavy and/or nearly degenerate nuclei.

Comments

The published version is located at http://prd.aps.org/abstract/PRD/v43/i9/p2956_1

Pages

2956-2970

Volume

43

Issue

9

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