Scaling limit of deeply virtual Compton scattering
Apr, 199610 pages
Published in:
- Phys.Lett.B 380 (1996) 417-425
e-Print:
- hep-ph/9604317 [hep-ph]
Report number:
- CEBAF-TH-96-05
Citations per year
Abstract: (Elsevier)
I outline a perturbative QCD approach to the analysis of the deeply virtual Compton scattering process γ ∗ p → γp′ in the limit of vanishing momentum transfer t = ( p ′ − p ) 2 . The DVCS amplitude in this limit exhibits a scaling behavior described by two-argument distributions F ( x , y ) which specify the fractions of the initial momentum p and the momentum transfer r ≡ p ′ − p carried by the constituents of the nucleon. The kernel R ( x , y ; ξ , η ) governing the evolution of the non-forward distributions F ( x , y ) has a remarkable property: it produces the GLAPD evolution kernel P( x ξ ) when integrated over y and reduces to the Brodsky-Lepage evolution kernel V ( y , η ) after the x -integration. This property is used to construct the solution of the one-loop evolution equation for the flavor non-singlet part of the non-forward quark distribution.Note:
- gziped, tar file of LaTeX paper plus 2 postscript figures,10 pages; some changes in new terminology
- photon p: exclusive reaction
- Compton scattering: off-shell
- off-shell: Compton scattering
- quantum chromodynamics: perturbation theory
- scaling
- Feynman graph: higher-order
- gluon: exchange
- exchange: gluon
- Lipatov equation
References(17)
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