Parton distribution functions from nonlocal light-cone operators with definite twist

Details Parton distribution functions from nonlocal light-cone operators with definite twist Parton distribution functions from nonlocal light-cone operators with definite twist

2000-09-27

arxiv.org/abs/hep-ph/0009309v4

Phys.Rev. D63 (2001) 094003

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, REVTEX, Extended version, The Introduction has been rewritten, Setion V "Wandzura-Wilczek--like relations" and App.

Scientific paper

10.1103/PhysRevD.63.094003

We introduce the chiral-even and chiral-odd quark distributions as forward matrix elements of related bilocal quark operators with well-defined (geometric) twist. Thereby, we achieve a Lorentz invariant classification of these distributions which differ from the conventional ones by explicitly taking into account the necessary trace terms. The relations between both kinds of distribution functions are given and the mismatch between their different definition of twist is discussed. Wandzura-Wilczek--like relations between the conventional distributions (based on dynamical twist) are derived by means of geometric twist distribution functions.

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