QCD Sum Rules and Compton Scattering
Claudio Coriano', Anatoly Radyushkin, George Sterman
Abstract
We extend QCD sum rule analysis to moderate energy fixed angle Compton scattering. In this kinematic region there is a strong similarity to the sum rule treatment of electromagnetic form factors, although the four-point amplitude requires a modification of the Borel transform. To illustrate our method, we derive the sum rules for helicity amplitudes in pion Compton scattering and estimate their large-t behavior in the local duality approximation.
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