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Electromagnetic properties for arbitrary spin particles: Natural electromagnetic moments from light-cone arguments

Cedric Lorce
(
- Mainz U., Inst. Kernphys.
)

Jan, 2009

12 pages

Published in:

Phys.Rev.D 79 (2009) 113011

e-Print:

0901.4200 [hep-ph]

DOI:

10.1103/PhysRevD.79.113011

View in:

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Abstract: (arXiv)

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.

13.88.+e
13.40.Em
particle: electromagnetic interaction
spin: high
helicity
light cone
scattering amplitude
tree approximation
moment: electromagnetic
vertex function

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