Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-01-27
Phys.Rev.D79:113011,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 1 table
Scientific paper
10.1103/PhysRevD.79.113011
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 $Q^2=0$ should be conserved non-trivially by the electromagnetic interaction, we are able to derive \emph{all} the natural electromagnetic moments for a pointlike particle of \emph{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 $Q^2=0$. As an application of our results, we generalize the discussion of quark transverse charge densities to particles with arbitrary spin.
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