2018/08/31 by Yang, Yongliang, Mao, Wenjuan, Lu, Zhun
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.1808.10565
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 ϕSh modulation, in which Sh 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, pT2), f^⊥(x, pT2) and g^⊥(x, pT2) and the twist-2 fragmentation functions H1(x, kT2), D1T^⊥(x, kT2) and G1T(x, kT2) in this asymmetry. Using spectator model, we compute these distribution and fragmentation functions and estimate the sin ϕSh asymmetry for the proton production as well as for the lambda production at JLab with a 12 GeV electron beam. The asymmetry at the COMPASS kinematics is also predicted. By comparing different sources for the asymmetry, we conclude that it is feasible to access the distribution function h and the fragmentation function H1 through measuring the asymmetry in the proton production, whereas the f^⊥ D1T^⊥ term might be probed in the lambda production at JLab 12 GeV.