Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-05-22
Phys. Rev. D 78, 114024 (2008)
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 9 figures
Scientific paper
10.1103/PhysRevD.78.114024
The leading twist transverse momentum dependent parton distribution function h_1T^perp, which is sometimes called ``pretzelosity,'' is studied. We review the theoretical properties of this function, and present bag model predictions. We 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 nucleon, is nothing but the pretzelosity distribution. Pretzelosity is chirally odd and can be accessed in combination with the Collins effect in semi-inclusive deep inelastic scattering, where it gives rise to an azimuthal single spin asymmetry proportional to sin(3phi-phi_S). We discuss the preliminary deuteron target data from COMPASS, on that observable and make predictions for future experiments on various targets at JLab, COMPASS and HERMES.
Avakian Harut
Efremov A. V.
Schweitzer Pascal
Yuan Fang-Fang
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