Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction [superscript 3]He[superscript ↑](e,e')X

We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction [superscript 3]He[superscript ↑](e,e')X on a polarized [superscript 3]He gas target. Assuming time-reversal invariance, this asymmetry is strictly zero in the Born...

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Bibliographic Details
Main Authors: Katich, J., Qian, X., Zhao, Y. X., Allada, Kalyan C., Aniol, K., Annand, J. R. M., Averett, T., Benmokhtar, F., Bertozzi, William, Bradshaw, P. C., Bosted, P., Camsonne, A., Canan, M., Cates, G. D., Chen, C., Chen, J.-P., Chen, W., Chirapatpimol, K., Chudakov, E., Cisbani, E., Cornejo, J. C., Cusanno, F., Dalton, M. M., Deconinck, Wouter, de Jager, C. W., De Leo, R., Deng, X., Deur, A., Ding, H., Dolph, P. A. M., Dutta, C., Dutta, D., El Fassi, L., Frullani, S., Gao, H., Garibaldi, F., Gaskell, D., Gilman, R., Glamazdin, O., Golge, S., Guo, L., Hamilton, D., Hansen, O., Higinbotham, D. W., Holmstrom, T., Huang, J., Huang, M., Ibrahim, H. F., Iodice, M., Jiang, X., Jin, G., Jones, M. K., Kelleher, A., Kim, W., Kolarkar, A., Korsch, W., LeRose, J. J., Li, X., Li, Y., Lindgren, R., Liyanage, N., Long, E., Lu, H.-J., Margaziotis, D. J., Markowitz, P., Marrone, S., McNulty, D., Meziani, Z.-E., Michaels, R., Moffit, Bryan J., Nanda, S., Narayan, A., Nelyubin, V., Norum, B. E., Oh, Y., Osipenko, M., Parno, D., Peng, J. C., Phillips, S. K., Posik, M., Puckett, A. J. R., Qiang, Y., Rakhman, A., Ransome, R. D., Riordan, S., Saha, A., Sawatzky, B., Schulte, E., Shahinyan, A., Shabestari, M. H., Stepanyan, S., Subedi, R., Sulkosky, V., Tang, L.-G., Tobias, A., Urciuoli, G. M., Vilardi, I., Wang, K., Wang, Y., Wojtsekhowski, B., Yan, X., Yao, H., Ye, Y., Ye, Z., Yuan, L., Zhan, X., Zhang, Y., Zhang, Y.-W., Zhao, B., Zheng, X., Zhu, L., Zhu, X., Zong, X., Gilad, Shalev, Munoz Camacho, C., Sirca, S., Puckett, A. J. R.
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:English
Published: American Physical Society 2014
Online Access:http://hdl.handle.net/1721.1/88613
Description
Summary:We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction [superscript 3]He[superscript ↑](e,e')X on a polarized [superscript 3]He gas target. Assuming time-reversal invariance, this asymmetry is strictly zero in the Born approximation but can be nonzero if two-photon-exchange contributions are included. The experiment, conducted at Jefferson Lab using a 5.89 GeV electron beam, covers a range of 1.7 < W < 2.9  GeV, 1.0 < Q[superscript 2] < 4.0  GeV[superscript 2 and 0.16 < x < 0.65. Neutron asymmetries were extracted using the effective nucleon polarization and measured proton-to-[superscript 3]He cross-section ratios. The measured neutron asymmetries are negative with an average value of (-1.09 ± 0.38) × 10[superscript -2] for invariant mass W > 2  GeV, which is nonzero at the 2.89σ level. Our measured asymmetry agrees both in sign and magnitude with a two-photon-exchange model prediction that uses input from the Sivers transverse momentum distribution obtained from semi-inclusive deep-inelastic scattering.