2001/06/30 by P. Závada, Petr Zavada
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.65.054040
published as Phys.Rev.D65:054040,2002 · 12 pages, Tex. In this slightly modified version one more sum rule is added. The paper is accepted for publication in Phys. Rev. D
arxiv created 2002/01/04 · openalex publication_date 2002/02/20 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The spin structure functions of the system of quasifree fermions on mass shell are studied in a consistently covariant approach. A comparison with the basic formulas following from the quark-parton model reveals the importance of the fermion motion inside the target for the correct evaluation of the spin structure functions. In particular it is shown that, regarding the moment \ensuremathΓ1, both the approaches are equivalent for the static fermions but differ by a factor 1/3 in the limit of massles fermions (m\ensuremath≪p0, in the target rest frame). Some other sum rules are discussed as well.