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

J. Katich , X. Qian , Y. X. Zhao , K. Allada , K. Aniol , J. R. M. Annand , T. Averett , F. Benmokhtar

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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. Mu\'noz 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. \v{S}irca S. Stepanyan R. Subedi V. Sulkosky L.-G. Tang A. Tobias G. M. Urciuoli I. Vilardi K. Wang Y. Wang B. Wojtsekhowski X. Yan H. Yao Y. Ye Z. Ye L. Yuan X. Zhan Y. Zhang Y.-W. Zhang B. Zhao X. Zheng L. Zhu X. Zhu X. Zong

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keywords asymmetrydeep-inelasticmeasuredscatteringasymmetriesmeasurementneutronnon-zero

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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, $1.0<Q^2<4.0$ GeV$^2$ and $0.16<x<0.65$. Neutron asymmetries were extracted using the effective nucleon polarization and measured proton-to-$^3$He cross section ratios. The measured neutron asymmetries are negative with an average value of $(-1.09 \pm 0.38) \times10^{-2}$ for invariant mass $W>2$ GeV, which is non-zero at the $2.89\sigma$ 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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Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction ³He^{uparrow}(e,e')X

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