Document Type
Article
Department/Program
Physics
Journal Title
Physical Review Letters
Pub Date
2012
Volume
108
Issue
5
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.
Recommended Citation
Huang, J.; Bertozzi, W.; Deconinck, W.; Katich, J.; Averett, Todd; Bradshaw, P. C.; Kelleher, A.; and Zhao, B., 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 (2012). Physical Review Letters, 108(5).
10.1103/PhysRevLett.108.052001
DOI
10.1103/PhysRevLett.108.052001
