Single spin asymmetry in transverse polarized proton production and production in semi-inclusive DIS at twist-3
School of Physics, Southeast University, 211189, Nanjing, China
2 School of Physics and Telecommunication Engineering, Zhoukou Normal University, 466000, Zhoukou, Henan, China
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Accepted: 11 March 2019
Published online: 11 June 2019
We study the single spin asymmetry in the transversely polarized proton production and the hyperon production in semi-inclusive deep inelastic scattering with a modulation, in which 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 , and and the twist-2 fragmentation functions , and in this asymmetry. Using the spectator models, we compute these distribution functions and fragmentation functions and estimate their contribution to the asymmetry for the proton production as well as for the 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 asymmetry for the transversely polarized proton production might be accessible in the SIDIS at the kinematics of JLab and COMPASS.
© Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2019