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

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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. ... continued below

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20 pages

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Brodsky, Stanley J.; Llanes-Estrada, Felipe J. & Szczepaniak, Adam P. December 5, 2008.

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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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20 pages

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  • Journal Name: Physical Review D

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  • Report No.: SLAC-PUB-13478
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 943474
  • Archival Resource Key: ark:/67531/metadc896936

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  • December 5, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 6, 2016, 12:38 p.m.

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Brodsky, Stanley J.; Llanes-Estrada, Felipe J. & Szczepaniak, Adam P. Local Two-Photon Couplings and the J=0 Fixed Pole in Real and Virtual Compton Scattering, article, December 5, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc896936/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.