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arXiv · 1311.0197

Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction $^{3}\mathrm{He}^{\uparrow}(e,e')X$

J. Katich·X. Qian·Y. X. Zhao·K. Allada·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·C. Dutta·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·J. Huang·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. Muńoz 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
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Abstract

We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction $^3$He$^{\uparrow}\left(e,e' \right)X$ on a polarized $^3$He gas target. Assuming time-reversal invariance, this asymmetry is strictly zero in the Born approximation but can be non-zero 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, $1.0 2$ GeV, which is non-zero 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.

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J. Katich, X. Qian, Y. X. Zhao, K. Allada, 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, C. Dutta, 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, J. Huang, 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. Muńoz 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. 2014-08-04. Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction $^{3}\mathrm{He}^{\uparrow}(e,e')X$. https://doi.org/10.1103/physrevlett.113.022502

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