Helicity-flip off-forward parton distributions of the nucleon
Abstract
We identify quark and gluon helicity-flip distributions defined between nucleon states of unequal momenta. The evolution of these distributions with a change of renormalization scale is calculated in the leading-logarithmic approximation. The helicity-flip gluon distributions do not mix with any quark distribution and are thus a unique signature of gluons in the nucleon. Their contribution to the generalized virtual Compton process is obtained both in the form of a factorization theorem and an operator product expansion. In deeply virtual Compton scattering, they can be probed through the distinct angular dependence of the cross section.
- Publication:
-
Physical Review D
- Pub Date:
- September 1998
- DOI:
- 10.1103/PhysRevD.58.054006
- arXiv:
- arXiv:hep-ph/9801369
- Bibcode:
- 1998PhRvD..58e4006H
- Keywords:
-
- 12.38.Bx;
- 13.60.Fz;
- Perturbative calculations;
- Elastic and Compton scattering;
- High Energy Physics - Phenomenology
- E-Print:
- a few corrections made, references changed