Electromagnetic Properties for Arbitrary Spin Particles: Part 2 - Natural Moments and Transverse Charge Densities
Abstract
In a set of two papers, we propose to study an old-standing problem, namely the electromagnetic interaction for particles of arbitrary spin. Based on the assumption that light-cone helicity at tree level and Q2=0 should be conserved non-trivially by the electromagnetic interaction, we are able to derive all the natural electromagnetic moments for a pointlike particle of any spin. In this second paper, we give explicit expressions for the light-cone helicity amplitudes in terms of covariant vertex functions, leading to the natural electromagnetic moments at Q2=0. As an application of our results, we generalize the discussion of quark transverse charge densities to particles with arbitrary spin.
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