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Measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the reaction He 3 ↑ (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. Muñoz 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, 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
  • College of William and Mary
  • University of Colorado Boulder
  • Duke University
  • California Institute of Technology
  • Brookhaven National Laboratory
  • University of Science and Technology of China
  • University of Kentucky
  • California State University Los Angeles
  • University of Glasgow
  • Carnegie Mellon University
  • Massachusetts Institute of Technology
  • Thomas Jefferson National Accelerator Facility
  • Old Dominion University
  • University of Virginia
  • Hampton University
  • National Institute for Nuclear Physics
  • Istituto Superiore di Sanita
  • University of Bari
  • Mississippi State University
  • Rutgers - The State University of New Jersey, New Brunswick
  • NASU - Kharkov Institute of Physics and Technology
  • Los Alamos National Laboratory
  • Longwood University
  • Cairo University
  • Kyungpook National University
  • China National Nuclear Corporation
  • University of New Hampshire
  • Florida International University
  • University of Massachusetts
  • Temple University
  • Université Clermont Auvergne
  • Seoul National University
  • University of Illinois at Urbana-Champaign
  • Syracuse University
  • A. Alikhanian Yerevan Institute of Physics
  • University of Ljubljana
  • Lanzhou University

Research output: Contribution to journalArticlepeer-review

Abstract

We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction He3↑(e,e′)X on a polarized He3 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<2.9GeV, 1.0<Q2<4.0GeV2 and 0.16<x<0.65. Neutron asymmetries were extracted using the effective nucleon polarization and measured proton-to-He3 cross-section ratios. The measured neutron asymmetries are negative with an average value of (-1.09±0.38)×10-2 for invariant mass W>2GeV, 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.

Original languageEnglish
Article number022502
JournalPhysical Review Letters
Volume113
Issue number2
DOIs
Publication statusPublished - 11 Jul 2014
Externally publishedYes

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