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In this work, we will evaluate the nucleon helicity flip form factor at thelimit of large momentum transfer. Hereby, we will study the exchange of one andtwo virtual photons separately. For the calculation of the scatteringamplitudes and nucleon transition probability matrix elements, we combine QCDperturbation theory with an expansion in nucleon distribution amplitudes. Usingthe combination of leading and sub-leading twist nucleon distributionamplitudes, one obtains the desired form factor. Using this technique, we willobtain a divergent result for the form factor. Nevertheless, the structure ofthe divergency can be extracted. Finally, we will comment the obtainedexpressions and discuss the behavior in unpolarized and polarized crosssections.

Evaluation of the Nucleon Helicity Flip Form Factor using One and Two Virtual Photons