Huang, J. and Qian, X. (2012) Beam-Target Double-Spin Asymmetry A_(LT) in Charged Pion Production from Deep Inelastic Scattering on a Transversely Polarized ^3He Target at 1.4<Q^2 < 2.7 GeV^2. Physical Review Letters, 108 (5). Art. No. 052001. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20120306-085115817
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We report the first measurement of the double-spin asymmetry A_(LT) for charged pion electroproduction in semi-inclusive deep-inelastic electron scattering on a transversely polarized ^3He target. The kinematics focused on the valence quark region, 0.16<x<0.35 with 1.4<Q^2<2.7 GeV^2. The corresponding neutron A_(LT) asymmetries were extracted from the measured ^3He asymmetries and proton over ^3He cross section ratios using the effective polarization approximation. These new data probe the transverse momentum dependent parton distribution function g_(1T)^q and therefore provide access to quark spin-orbit correlations. Our results indicate a positive azimuthal asymmetry for π^- production on ^3He and the neutron, while our π^+ asymmetries are consistent with zero.
|Additional Information:||© 2012 American Physical Society. Received 8 August 2011; published 30 January 2012. We acknowledge the outstanding support of the JLab Hall A technical staff and Accelerator Division in accomplishing this experiment. This work was supported in part by the U.S. National Science Foundation, and by U.S. DOE contract DE-AC05-06OR23177, under which Jefferson Science Associates, LLC operates the Thomas Jefferson National Accelerator Facility.|
|Classification Code:||PACS: 14.20.Dh, 25.30.Fj, 25.30.Rw, 24.85.+p|
|Official Citation:||Beam-Target Double-Spin Asymmetry ALT in Charged Pion Production from Deep Inelastic Scattering on a Transversely Polarized 3He Target at 1.4<Q2<2.7 GeV2 J. Huang et al. (The Jefferson Lab Hall A Collaboration) Published 30 January 2012 (6 pages) 052001|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||13 Mar 2012 18:05|
|Last Modified:||26 Dec 2012 14:54|
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