Low-energy Compton scattering: The magnetic polarizability of the nucleon

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Abstract
An expression for the magnetic polarizability of the nucleon is derived using gauge and relativistic invariance. Besides the well-known term that contains products of magnetic dipole transition moments it is shown that there exists a second contribution related to third moments of the current-charge density commutator. An estimation of the proton magnetic polarizability leads to a result which is consistent with the available experimental value.