Pretzelosity distribution function h_1T^perp and the single spin asymmetry A_UT^sin(3phi-phi_S)

H. Avakian; A. V. Efremov; P. Schweitzer; F. Yuan

doi:10.1103/physrevd.78.114024

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arXiv · 0805.3355

Pretzelosity distribution function h_1T^perp and the single spin asymmetry A_UT^sin(3phi-phi_S)

H. Avakian·A. V. Efremov·P. Schweitzer·F. Yuan

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Abstract

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.

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H. Avakian, A. V. Efremov, P. Schweitzer, F. Yuan. 2008-05-22. Pretzelosity distribution function h_1T^perp and the single spin asymmetry A_UT^sin(3phi-phi_S). https://doi.org/10.1103/physrevd.78.114024

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