Nonforward parton distributions
Abstract
Applications of perturbative QCD to deeply virtual Compton scattering and hard exclusive electroproduction processes require a generalization of usual parton distributions for the case when long-distance information is accumulated in nonforward matrix elements <p'\|O(0,z)\|p> of quark and gluon light-cone operators. We describe two types of nonperturbative functions parametrizing such matrix elements: double distributions F(x,y;t) and nonforward distribution functions Fζ(Xt), discuss their spectral properties, evolution equations which they satisfy, basic uses and general aspects of factorization for hard exclusive processes.
- Publication:
-
Physical Review D
- Pub Date:
- November 1997
- DOI:
- 10.1103/PhysRevD.56.5524
- arXiv:
- arXiv:hep-ph/9704207
- Bibcode:
- 1997PhRvD..56.5524R
- Keywords:
-
- 12.38.Bx;
- 13.60.Fz;
- 13.60.Le;
- Perturbative calculations;
- Elastic and Compton scattering;
- Meson production;
- High Energy Physics - Phenomenology
- E-Print:
- Final version, to be published in Phys.Rev.D