DVCS amplitude with kinematical twist-3 terms

Journal Article · Tue Aug 01 00:00:00 EDT 2000 · Phys.Lett.B493:332-340,2000

DOI:https://doi.org/10.1016/S0370-2693(00)01155-2· OSTI ID:760439

Radyushkin, A V; Weiss, C

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.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 760439
• Report Number(s): JLAB-THY-00-29; DOE/ER/40150-1742; hep-ph/0008214; RUB-TPII-14/00; TRN: US0100884
• Journal Information: Phys.Lett.B493:332-340,2000, Vol. B, Issue 493; Other Information: Submitted to Phys.Lett.B493:332-340,2000; PBD: 1 Aug 2000
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
COMPTON EFFECT
FACTORIZATION
GAUGE INVARIANCE
PARTONS
POLARIZATION
QUANTUM CHROMODYNAMICS