Nucleon Transversity Distribution from Azimuthal Spin Asymmetry in Pion Electroproduction

Abstract

The azimuthal asymmetry observed by the HERMES collaboration in semi-inclusive pion production in deep inelastic scattering of unpolarized positron on the longitudinally polarized proton target, can provide information of the quark transversity distributions of the nucleon. We show that the quark transversity distributions predicted both by the light-cone quark-spectator-diquark model and by a pQCD inspired model can give consistent descriptions of the available HERMES data for the analyzing powers $A_{UL}^{\sin \varphi }$ and $A_{UL}^{\sin 2\varphi }$ for ${\pi }^{+}$ and ${\pi }^{-}$ productions. We also show that the two models give similar predictions of $A_{UL}^{\sin \varphi }$ for ${\pi }^{+}$ production, whereas they give very different predictions of $A_{UL}^{\sin \varphi }$ for ${\pi }^{-}$ production at large $x$. Further precision measurement of $A_{UL}^{\sin \varphi }$ for ${\pi }^{-}$ production can provide a decisive test of different models.

arXiv comment11 latex pages, 1 figure, version to appear in PRD

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• Sivers Function in the MIT Bag Model
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• Azimuthal Spin Asymmetries of Pion Electroproduction
• Connection between the Sivers function and the anomalous magnetic moment
• Light-cone divergence in twist-3 correlation functions
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• Reanalysis of Azimuthal Spin Asymmetries of Meson Electroproduction
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• Proposal for measuring new transverse momentum dependent parton distributions $g_{1T}$ and $h_{1L}^{\perp }$ through semi-inclusive deep inelastic scattering
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