Single Spin Asymmetries in Charged Pion Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely Polarized $^3$He Target
We report the first measurement of target single spin asymmetries in the semi-inclusive $$^3{He}(e,e'\pi^\pm)X$$ reaction on a transversely polarized target. The experiment, conducted at Jefferson Lab using a 5.9 GeV electron beam, covers a range of 0.14 $< x <$ 0.34 with 1.3 $<Q^2<$ 2.7 GeV$^2$. The Collins and Sivers moments were extracted from the azimuthal angular dependence of the measured asymmetries. The extracted $$\pi^\pm$$ Collins moments for $^3$He are consistent with zero, except for the $$\pi^+$$ moment at $x=0.34$, which deviates from zero by 2.3$$\sigma$$. While the $$\pi^-$$ Sivers moments are consistent with zero, the $$\pi^+$$ Sivers moments favor negative values. The neutron results were extracted using the nucleon effective polarization and the measured cross section ratio of proton to $^3$He, and are largely consistent with the predictions of phenomenological fits and quark model calculations.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1021723
- Report Number(s):
- JLAB-PHY-11-1332; DOE/OR/23177-1576; arXiv:1106.0363; PRLTAO; TRN: US1104039
- Journal Information:
- Phys.Rev. Lett., Vol. 107, Issue 07; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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