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Single spin asymmetry in transverse polarized proton production and \(\Lambda\) production in semi-inclusive DIS at twist-3

  • Yongliang Yang
  • Wenjuan Mao
  • Zhun LuEmail author
Regular Article
  • 8 Downloads

Abstract.

We study the single spin asymmetry in the transversely polarized proton production and the \(\Lambda\) hyperon production in semi-inclusive deep inelastic scattering with a \(\sin \phi_{S_h}\) modulation, in which \(\phi_{S_h}\) is the azimuthal angle of the transverse spin of the final hadron. The theoretical interpretation for the asymmetry is presented as the convolution of the twist-3 quark transverse-momentum-dependent distributions and twist-2 fragmentation functions. We investigate the role of the twist-3 distribution functions \( h(x,\mathbf{p}_{T}^{2})\), \( f^{\perp}(x,\mathbf{p}_{T}^{2})\) and \( g^{\perp}(x,\mathbf{p}_{T}^{2})\) and the twist-2 fragmentation functions \( H_{1}(x,\mathbf{k}_{T}^{2})\), \( D_{1T}^\perp(x,\mathbf{k}_T^2)\) and \( G_{1T}(x,\mathbf{k}_T^2)\) in this asymmetry. Using the spectator models, we compute these distribution functions and fragmentation functions and estimate their contribution to the \( \sin \phi_{S_{h}}\) asymmetry for the proton production as well as for the \(\Lambda\) production at JLab with a 12GeV electron beam. The asymmetry at the COMPASS kinematics is also predicted. By comparing different sources for the asymmetry, we conclude that sizable \(\sin \phi_{S_{h}}\) asymmetry for the transversely polarized proton production might be accessible in the SIDIS at the kinematics of JLab and COMPASS.

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Copyright information

© Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of PhysicsSoutheast UniversityNanjingChina
  2. 2.School of Physics and Telecommunication EngineeringZhoukou Normal UniversityZhoukouChina

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