Double Spin Asymmetries of Inclusive Hadron Electroproductions from a Transversely Polarized ${}^3\mathrm{He}$ Target

Abstract

We report the measurement of beam-target double-spin asymmetries ($A_{\text{LT}}$) in the inclusive production of identified hadrons, $\vec{e}$+${}^3{\text{He}}^{\uparrow }\to h+X$, using a longitudinally polarized 5.9 GeV electron beam and a transversely polarized ${}^3\mathrm{He}$ target. Hadrons ($\ddot{I}{€}^{\pm }$, $K^{\pm }$ and proton) were detected at 16${}^{\circ }$ with an average momentum $<$$P_h$$>$=2.35 GeV/c and a transverse momentum ($p_T$) coverage from 0.60 to 0.68 GeV/c. Asymmetries from the ${}^3\text{He}$ target were observed to be non-zero for $\ddot{I}{€}^{\pm }$ production when the target was polarized transversely in the horizontal plane. The $\ddot{I}{€}^{+}$ and $\ddot{I}{€}^{-}$ asymmetries have opposite signs, analogous to the behavior of $A_{\text{LT}}$ in semi-inclusive deep-inelastic scattering.

Published in PRC (92.015207), nuclear experiment, high-energy experiment