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

TL;DR

This paper reports measurements of double-spin asymmetries in inclusive hadron production from a transversely polarized helium-3 target, revealing non-zero asymmetries and sign differences between positive and negative pions, advancing understanding of spin effects in hadronization.

Contribution

First measurement of $A_{LT}$ asymmetries in inclusive hadron production from a transversely polarized $^3$He target at 5.9 GeV, showing non-zero asymmetries and sign patterns similar to SIDIS.

Findings

Non-zero asymmetries observed for $ ext{^3He}$ target.

Opposite signs for $ ext{π}^+$ and $ ext{π}^-$ asymmetries.

Asymmetry behavior analogous to semi-inclusive deep-inelastic scattering.

Abstract

We report the measurement of beam-target double-spin asymmetries ($A_\text{LT}$) in the inclusive production of identified hadrons, $\vec{e}~$+$~^3\text{He}^{\uparrow}\rightarrow h+X$, using a longitudinally polarized 5.9 GeV electron beam and a transversely polarized $^3\rm{He}$ target. Hadrons ($\pi^{\pm}$, $K^{\pm}$ 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 $\pi^{\pm}$ production when the target was polarized transversely in the horizontal plane. The $\pi^{+}$ and $\pi^{-}$ asymmetries have opposite signs, analogous to the behavior of $A_\text{LT}$ in semi-inclusive deep-inelastic scattering.