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arXiv · 0812.0395

Local Two-Photon Couplings and the J=0 Fixed Pole in Real and Virtual Compton Scattering

Stanley J. Brodsky·Felipe J. Llanes-Estrada·Adam P. Szczepaniak
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Abstract

The local coupling of two photons to the fundamental quark currents of a hadron gives an energy-independent contribution to the Compton amplitude proportional to the charge squared of the struck quark, a contribution which has no analog in hadron scattering reactions. We show that this local contribution has a real phase and is universal, giving the same contribution for real or virtual Compton scattering for any photon virtuality and skewness at fixed momentum transfer squared t. The t-dependence of this J=0 fixed Regge pole is parameterized by a yet unmeasured even charge-conjugation form factor of the target nucleon. The t=0 limit gives an important constraint on the dependence of the nucleon mass on the quark mass through the Weisberger relation. We discuss how this 1/x form factor can be extracted from high energy deeply virtual Compton scattering and examine predictions given by models of the H generalized parton distribution.

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Stanley J. Brodsky, Felipe J. Llanes-Estrada, Adam P. Szczepaniak. 2008-12-02. Local Two-Photon Couplings and the J=0 Fixed Pole in Real and Virtual Compton Scattering. https://doi.org/10.1103/physrevd.79.033012

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