Single spin asymmetries in charged pion production from semi-inclusive deep inelastic scattering on a transversely polarized ³He target at Q²=1.4–2.7 GeV²

Qian, X. et al. (2011) Single spin asymmetries in charged pion production from semi-inclusive deep inelastic scattering on a transversely polarized ³He target at Q²=1.4–2.7 GeV². Physical Review Letters, 107(7), 072003. (doi: 10.1103/PhysRevLett.107.072003)

Abstract

We report the first measurement of target single spin asymmetries in the semi-inclusive ³He(e,e′π^±)X reaction on a transversely polarized target. The experiment, conducted at Jefferson Lab using a 5.9 GeV electron beam, covers a range of 0.16<x<0.35 with 1.4<Q²<2.7  GeV². 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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Annand, Dr John and Hamilton, Dr David
• Authors: Qian, X., Allada, K., Dutta, C., Huang, J., Katich, J., Wang, Y., Zhang, Y., Aniol, K., Annand, J., Averett, T., Benmokhtar, F., Bertozzi, W., Bradshaw, P., Bosted, P., Camsonne, A., Canan, M., Cates, G., Chen, C., Chen, J.-P., Chen, W., Chirapatpimol, K., Chudakov, E., Cisbani, E., Cornejo, J., Cusanno, F., Dalton, M., Deconinck, W., de Jager, C., De Leo, R., Deng, X., Deur, A., Ding, H., Dolph, P., Dutta, D., El Fassi, L., Frullani, S., Gao, H., Garibaldi, F., Gaskell, D., Gilad, S., Gilman, R., Glamazdin, O., Golge, S., Guo, L., Hamilton, D., Hansen, O., Higinbotham, D., Holmstrom, T., Huang, M., Ibrahim, H., Iodice, M., Jiang, X., Jin, G., Jones, M., Kelleher, A., Kim, W., Kolarkar, A., Korsch, W., LeRose, J., Li, X., Li, Y., Lindgren, R., Liyanage, N., Long, E., Lu, H.-J., Margaziotis, D., Markowitz, P., Marrone, S., McNulty, D., Meziani, Z.-E., Michaels, R., Moffit, B., Muñoz Camacho, C., Nanda, S., Narayan, A., Nelyubin, V., Norum, B., Oh, Y., Osipenko, M., Parno, D., Peng, J., Phillips, S., Posik, M., Puckett, A., Qiang, Y., Rakhman, A., Ransome, R., Riordan, S., Saha, A., Sawatzky, B., Schulte, E., Shahinyan, A., Shabestari, M., Širca, S., Stepanyan, S., Subedi, R., Sulkosky, V., Tang, L.-G., Tobias, A., Urciuoli, G., Vilardi, I., Wang, K., Wojtsekhowski, B., Yan, X., Yao, H., Ye, Y., Ye, Z., Yuan, L., Zhan, X., Zhang, Y.-W., Zhao, B., Zheng, X., Zhu, L., Zhu, X., and Zong, X.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114
• Published Online: 10 August 2011