DVCS amplitude with kinematical twist-3 terms

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The authors compute the amplitude of deeply virtual Compton scattering (DVCS) using the calculus of QCD string operators in coordinate representation. To restore the electromagnetic gauge invariance (transversality) of the twist-2 amplitude they include the operators of twist-3 which appear as total derivatives of twist-2 operators. The results are equivalent to a Wandzura-Wilczek approximation for twist-3 skewed parton distributions. They find that this approximation gives a finite result for the amplitude of a longitudinally polarized virtual photon, while the amplitude for transverse polarization is divergent, i.e., factorization breaks down in this term.

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161 KILOBYTES pages

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Radyushkin, A.V. & Weiss, C. August 1, 2000.

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Description

The authors compute the amplitude of deeply virtual Compton scattering (DVCS) using the calculus of QCD string operators in coordinate representation. To restore the electromagnetic gauge invariance (transversality) of the twist-2 amplitude they include the operators of twist-3 which appear as total derivatives of twist-2 operators. The results are equivalent to a Wandzura-Wilczek approximation for twist-3 skewed parton distributions. They find that this approximation gives a finite result for the amplitude of a longitudinally polarized virtual photon, while the amplitude for transverse polarization is divergent, i.e., factorization breaks down in this term.

Physical Description

161 KILOBYTES pages

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  • Journal Name: Phys.Lett.B493:332-340,2000; Journal Volume: B; Journal Issue: 493; Other Information: Submitted to Phys.Lett.B493:332-340,2000

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  • Report No.: JLAB-THY-00-29
  • Report No.: DOE/ER/40150-1742
  • Report No.: hep-ph/0008214
  • Report No.: RUB-TPII-14/00
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 760439
  • Archival Resource Key: ark:/67531/metadc717128

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 1, 2000

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 8:48 p.m.

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Radyushkin, A.V. & Weiss, C. DVCS amplitude with kinematical twist-3 terms, article, August 1, 2000; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc717128/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.