Twist-3 effects in deeply virtual Compton scattering made simple

Details Twist-3 effects in deeply virtual Compton scattering made simple Twist-3 effects in deeply virtual Compton scattering made simple

2002-10-16

arxiv.org/abs/hep-ph/0210237v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, uses ws-p8-50x6-00.cls . Proceedings of the Baryons 2002 Conference, Jefferson Lab, Newport News, VA, Marc

Scientific paper

We show that electromagnetic gauge invariance requires a 'spin rotation' of the quarks in the usual twist-2 contribution to the amplitude for deeply virtual Compton scattering. This rotation is equivalent to the inclusion of certain kinematical twist-3 (Wandzura-Wilczek type) terms, which have been derived previously using other methods. The new representation of the twist-3 terms is very compact and allows for a simple physical interpretation.

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