Single-spin asymmetries in electroproduction of pions on the longitudinally polarized nucleon targets

Abstract

We study the single-spin asymmetries of pions produced in semi-inclusive deep-inelastic scattering on the longitudinally polarized nucleon targets. We particularly consider the effects of the twist-3 transverse-momentum dependent distribution functions $f_L^{\perp }$ and $h_L$ to the asymmetry. We calculate the asymmetric moment $A_{UL}^{\sin {\varphi }_h}$ for ${\pi }^{+}$, ${\pi }^{-}$ and ${\pi }^0$ produced off the proton target at HERMES and compare the results with the HERMES data. We also present the prediction of the same asymmetries for different pions at the kinematics of CLAS 5.5 GeV on a proton target, as well as at COMPASS on a deuteron target.

Comments: Figure added, reference updated, match the published version in PRD