We report the measurement of beam-target double spin asymmetries (ALT) in the inclusive production of identified hadrons, e⃗ + 3He↑→h+X, using a longitudinally polarized 5.9-GeV electron beam and a transversely polarized 3He target. Hadrons (π±,K±, and proton) were detected at 16∘ with an average momentum ⟨Ph⟩=2.35 GeV/c and a transverse momentum (pT) coverage from 0.60 to 0.68 GeV/c. Asymmetries from the 3He target were observed to be nonzero for π± production when the target was polarized transversely in the horizontal plane. The π+ and π− asymmetries have opposite signs, analogous to the behavior of ALT in semi-inclusive deep-inelastic scattering.
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This work was supported in part by the US National Science Foundation and by Department of Energy (DOE) Contract No. DE-AC05-06OR23177, under which the Jefferson Science Associates operates the Thomas Jefferson National Accelerator Facility. This work was also supported by the National Natural Science Foundation of China under Grants No. 11135002 and No. 11120101004 and the UK Science and Technology Facilities Council under Grants No. 57071/1 and No. 50727/1.
Dutta, C.; Kolarkar, A.; Korsch, Wolfgang; Zhao, Y. X.; Allada, K.; Aniol, K.; Annand, J. R. M.; Averett, T.; Benmokhtar, F.; Bertozzi, W.; Bradshaw, P. C.; Bosted, P.; and Camsonne, A., "Double Spin Asymmetries of Inclusive Hadron Electroproduction From a Transversely Polarized 3He Target" (2015). Physics and Astronomy Faculty Publications. 298.