1108.0489 (J. Huang et al.)

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    [PDF]

J. Huang, K. Allada, C. Dutta, J. Katich, X. Qian, Y. Wang, Y. Zhang, K. Aniol, J. R. M. Annand, T. Averett, F. Benmokhtar, W. Bertozzi, P. C. Bradshaw, P. Bosted, A. Camsonne, M. Canan, G. D. Cates, C. Chen, J. -P. Chen, W. Chen, K. Chirapatpimol, E. Chudakov, E. Cisbani, J. C. Cornejo, F. Cusanno, M. M. Dalton, W. Deconinck, C. W. de Jager, R. De Leo, X. Deng, A. Deur, H. Ding, P. A. M. Dolph, D. Dutta, L. El Fassi, S. Frullani, H. Gao, F. Garibaldi, D. Gaskell, S. Gilad, R. Gilman, O. Glamazdin, S. Golge, L. Guo, D. Hamilton, O. Hansen, D. W. Higinbotham, T. Holmstrom, M. Huang, H. F. Ibrahim, M. Iodice, X. Jiang, G. Jin, M. K. Jones, A. Kelleher, W. Kim, A. Kolarkar, W. Korsch, J. J. LeRose, X. Li, Y. Li, R. Lindgren, N. Liyanage, E. Long, H. -J. Lu, D. J. Margaziotis, P. Markowitz, S. Marrone, D. McNulty, Z. -E. Meziani, R. Michaels, B. Moffit, C. Muñoz Camacho, S. Nanda, A. Narayan, V. Nelyubin, B. Norum, Y. Oh, M. Osipenko, D. Parno, J. C. Peng, S. K. Phillips, M. Posik, A. J. R. Puckett, Y. Qiang, A. Rakhman, R. D. Ransome, S. Riordan, A. Saha, B. Sawatzky, E. Schulte, A. Shahinyan, M. H. Shabestari, S. Širca, S. Stepanyan, R. Subedi, V. Sulkosky, L. -G. Tang, A. Tobias, G. M. Urciuoli, I. Vilardi, K. Wang, B. Wojtsekhowski, X. Yan, H. Yao, Y. Ye, Z. Ye, L. Yuan, X. Zhan, Y. -W. Zhang, B. Zhao, X. Zheng, L. Zhu, X. Zhu, X. Zong, for the Jefferson Lab Hall A Collaboration

We report the first measurement of the double-spin asymmetry $A_{LT}$ for
charged pion electroproduction in semi\nobreakdash-inclusive
deep\nobreakdash-inelastic electron scattering on a transversely polarized
$^{3}$He target. The kinematics focused on the valence quark region,
$0.16$A_{LT}$ asymmetries were extracted from the measured $^{3}$He asymmetries and
proton over $^{3}$He 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 $^{3}$He and the neutron, while our $\pi^{+}$
asymmetries are consistent with zero.

View original: http://arxiv.org/abs/1108.0489