Symmetries and structure of skewed and double distributions

Details Symmetries and structure of skewed and double distributions Symmetries and structure of skewed and double distributions

1998-10-23

arxiv.org/abs/hep-ph/9810466v3

Phys.Lett.B449:81-88,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, Latex, 3 figures

Scientific paper

10.1016/S0370-2693(98)01584-6

Extending the concept of parton densities onto nonforward matrix elements of quark and gluon light-cone operators, one can use two types of nonperturbative functions: double distributions (DDs) f(x,\alpha;t), F(x,y;t) and skewed (off&nonforward) parton distributions (SPDs) H(x,\xi;t), F_\zeta(X,t). We treat DDs as primary objects producing SPDs after integration. We emphasize the role of DDs in understanding interplay between X (x) and \zeta (\xi) dependences of SPDs.In particular, the use of DDs is crucial to secure the polynomiality condition: Nth moments of SPDs are Nth degree polynomials in the relevant skewedness parameter \zeta or \xi. We propose simple ansaetze for DDs having correct spectral and symmetry properties and derive model expressions for SPDs satisfying all known constraints. Finally, we argue that for small skewedness, one can obtain SPDs from the usual parton densities by averaging the latter with an appropriate weight over the region [X-\zeta,X] (or [x - \xi, x + \xi]).

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