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)

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We report the first measurement of target single spin asymmetries in the semi-inclusive <sup>3</sup>He(e,e′π<sup>±</sup>)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<Q<sup>2</sup><2.7  GeV<sup>2</sup>. The Collins and Sivers moments were extracted from the azimuthal angular dependence of the measured asymmetries. The π<sup>±</sup>)Collins moments for <sup>3</sup>He are consistent with zero, except for the π<sup>+</sup> moment at x=0.35, which deviates from zero by 2.3σ. While the π<sup>−</sup> Sivers moments are consistent with zero, the π<sup>+</sup> Sivers moments favor negative values. The neutron results were extracted using the nucleon effective polarization and measured cross section ratios of proton to <sup>3</sup>He, and are largely consistent with the predictions of phenomenological fits and quark model calculations.

Item Type:Articles
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 (Online):1079-7114
Published Online:10 August 2011

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