Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-12-02
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 15 figures
Scientific paper
10.1103/PhysRevD.79.033012
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.
Brodsky Stanley J.
Llanes-Estrada Felipe J.
Szczepaniak Adam P.
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