Measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the reaction (3)He(↑)(e,e')X.
We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction 3)He(↑)(e,e')X on a polarized (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<2.9 GeV, 1.02 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.
Katich, J; Qian, X; Zhao, YX; Allada, K; Aniol, K; Annand, JRM; Averett, T; Benmokhtar, F; Bertozzi, W; Bradshaw, PC; Bosted, P; Camsonne, A; Canan, M; Cates, GD; Chen, C; Chen, J-P; Chen, W; Chirapatpimol, K; Chudakov, E; Cisbani, E; Cornejo, JC; Cusanno, F; Dalton, MM; Deconinck, W; de Jager, CW; De Leo, R; Deng, X; Deur, A; Ding, H; Dolph, PAM; Dutta, C; 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, DW; Holmstrom, T; Huang, J; Huang, M; Ibrahim, HF; Iodice, M; Jiang, X; Jin, G; Jones, MK; Kelleher, A; Kim, W; Kolarkar, A; Korsch, W; LeRose, JJ; Li, X; Li, Y; Lindgren, R; Liyanage, N; Long, E; Lu, H-J; Margaziotis, DJ; 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, JC; Phillips, SK; Posik, M; Puckett, AJR; Qiang, Y; Rakhman, A; Ransome, RD; Riordan, S; Saha, A; Sawatzky, B; Schulte, E; Shahinyan, A; Shabestari, MH; Širca, S; Stepanyan, S; Subedi, R; Sulkosky, V; Tang, L-G; Tobias, A; Urciuoli, GM; 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
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