Document Type

Article

Publication Date

8-10-2011

Abstract

We report the first measurement of target single spin asymmetries in the semi-inclusive 3He(e,eπ±)X reaction on a transversely polarized target. The experiment, conducted at Jefferson Lab using a 5.9 GeV electron beam, covers a range of 0.1622. The Collins and Sivers moments were extracted from the azimuthal angular dependence of the measured asymmetries. The π± Collins moments for 3He are consistent with zero, except for the π+ moment at x=0.35, which deviates from zero by 2.3σ. While the π- Sivers moments are consistent with zero, the π+ Sivers moments favor negative values. The neutron results were extracted using the nucleon effective polarization and measured cross section ratios of proton to 3He, and are largely consistent with the predictions of phenomenological fits and quark model calculations.

DOI

10.1103/PhysRevLett.107.072003

Version

Publisher's PDF

Comments

© 2011 American Physical Society. The original publication is available at http://link.aps.org/doi/10.1103/PhysRevLett.107.072003

Original Citation

Phys. Rev. Lett. 107, 072003 (2011)

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Physics Commons

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