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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
; | | Date: |
2 Dec 2008 | | 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. | | Source: | arXiv, 0812.0395 | | Services: | Forum | Review | PDF | Favorites | |
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