Twist-2 Compton operator and its hidden Wandzura-Wilczek and Callan-Gross structures

@article{Geyer2004Twist2CO,
  title={Twist-2 Compton operator and its hidden Wandzura-Wilczek and Callan-Gross structures},
  author={Bodo Geyer and Dieter Robaschik},
  journal={Physical Review D},
  year={2004},
  volume={71},
  pages={054018}
}
Power corrections for virtual Compton scattering at leading twist are determined at operator level. From the complete off-cone representation of the twist-2 Compton operator integral representations for the trace, antisymmetric and symmetric part of that operator are derived. The operator valued invariant functions are written in terms of iterated operators and may lead to interrelations. For matrix elements they go over into relations for generalized parton distributions. Reducing to the s… 
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