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Beam-Target Double-Spin Asymmetry A(LT) in Charged Pion Production from Deep Inelastic Scattering on a Transversely Polarized He-3 Target at 1.4 < Q(2) < 2.7 GeV2
Huang, J. Bertozzi, W. Deconinck, W. Katich, J. Averett, Todd Bradshaw, P. C. Kelleher, A. Zhao, B.
Huang, J.
Bertozzi, W.
Deconinck, W.
Katich, J.
Averett, Todd
Bradshaw, P. C.
Kelleher, A.
Zhao, B.
Abstract
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 He-3 target. The kinematics focused on the valence quark region, 0.16 < x < 0.35 with 1.4 < Q(2) < 2.7 GeV2. The corresponding neutron A(LT) asymmetries were extracted from the measured He-3 asymmetries and proton over He-3 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 pi(-) production on He-3 and the neutron, while our pi(+) asymmetries are consistent with zero.
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2012-01-01
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Physics
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https://doi.org/10.1103/PhysRevLett.108.052001