2009/02/04 by H. Avakian, А. В. Ефремов, A. V. Efremov +9
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.0902.0689
12 pages, 12 figure, presented at Advanced Studies Institute -- Symmetries And Spin" (SPIN-Praha-2008), Prague, July 20-26, 2008, to be published Eur.Phys.J, ST, style files included. Dedicated to 65 anniversary of Professor Klaus Goeke
openalex publication_date 2009/02/04 · arxiv created 2009/03/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The leading twist transverse momentum dependent parton distribution functions h1L⊥ and h1T^⊥, which is sometimes called "pretzelosity," are studied. For h1L⊥ we consider a "Wandzura-Wilczek-type" approximation, which follows from QCD equations of motion upon the neglect of pure twist-3 terms and allows to express it in terms of transversity. On the basis of available data from HERMES we test the practical usefulness of this approximation and discuss how it can be further tested by future CLAS and COMPASS data. We review the theoretical properties of retzelosity and observe an interesting relation valid in a large class of relativistic models: The difference between helicity and transversity distributions, which is often said to be a 'measure of relativistic effects' in the nucleon, is nothing but the transverse moment of pretzelosity. We discuss preliminary deuteron target data from COMPASS on the single spin asymmetry (SSA) in semi-inclusive deep inelastic scattering (SIDIS) related to pretzelosity, and make predictions for future experiments at JLab, COMPASS and HERMES.