Quantum Fiel Theoretic Treatment of the Non-Forward Compton Amplitude in the Generalized Bjorken Region

Details Quantum Fiel Theoretic Treatment of the Non-Forward Compton Amplitude in the Generalized Bjorken Region Quantum Fiel Theoretic Treatment of the Non-Forward Compton Amplitude in the Generalized Bjorken Region

2000-07-12

arxiv.org/abs/hep-ph/0007125v1

Nucl.Phys.Proc.Suppl.89:155-161,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages LATEX, 1 style file, DESY 00-045, Contribution to the Proceedings of `Loops and Legs in Quantum Field Theory', Bastei,

Scientific paper

10.1016/S0920-5632(00)00838-0

A quantum field theoretic treatment of the leading light-cone part of the virtual Compton amplitude is presented. The twist-decomposition of the operators is performed by a group-theoretic procedure respecting the Lorentz group O(3,1). The twist-2 contributions to the Compton amplitude are calculated and it is shown that the electromagnetic current is conserved for these terms. Relations between the amplitude functions associated to the symmetric and asymmetric part of the Compton amplitude are derived. These relations generalize the Callan-Gross and Wandzura-Wilczek relations of forward scattering for the non-forward Compton amplitude.

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