Physics Letters B (Jan 2019)

Measurement of double-polarization asymmetries in the quasi-elastic He→3(e→,e′p) process

  • M. Mihovilovič,
  • G. Jin,
  • E. Long,
  • Y.-W. Zhang,
  • K. Allada,
  • B. Anderson,
  • J.R.M. Annand,
  • T. Averett,
  • W. Bertozzi,
  • W. Boeglin,
  • P. Bradshaw,
  • A. Camsonne,
  • M. Canan,
  • G.D. Cates,
  • C. Chen,
  • J.P. Chen,
  • E. Chudakov,
  • R. De Leo,
  • X. Deng,
  • A. Deltuva,
  • A. Deur,
  • C. Dutta,
  • L. El Fassi,
  • D. Flay,
  • S. Frullani,
  • F. Garibaldi,
  • H. Gao,
  • S. Gilad,
  • R. Gilman,
  • O. Glamazdin,
  • J. Golak,
  • S. Golge,
  • J. Gomez,
  • O. Hansen,
  • D.W. Higinbotham,
  • T. Holmstrom,
  • J. Huang,
  • H. Ibrahim,
  • C.W. de Jager,
  • E. Jensen,
  • X. Jiang,
  • M. Jones,
  • H. Kamada,
  • H. Kang,
  • J. Katich,
  • H.P. Khanal,
  • A. Kievsky,
  • P. King,
  • W. Korsch,
  • J. LeRose,
  • R. Lindgren,
  • H.-J. Lu,
  • W. Luo,
  • L.E. Marcucci,
  • P. Markowitz,
  • M. Meziane,
  • R. Michaels,
  • B. Moffit,
  • P. Monaghan,
  • N. Muangma,
  • S. Nanda,
  • B.E. Norum,
  • K. Pan,
  • D.S. Parno,
  • E. Piasetzky,
  • M. Posik,
  • V. Punjabi,
  • A.J.R. Puckett,
  • X. Qian,
  • Y. Qiang,
  • X. Qui,
  • S. Riordan,
  • A. Saha,
  • P.U. Sauer,
  • B. Sawatzky,
  • R. Schiavilla,
  • B. Schoenrock,
  • M. Shabestari,
  • A. Shahinyan,
  • S. Širca,
  • R. Skibiński,
  • J. St. John,
  • R. Subedi,
  • V. Sulkosky,
  • W. Tireman,
  • W.A. Tobias,
  • K. Topolnicki,
  • G.M. Urciuoli,
  • M. Viviani,
  • D. Wang,
  • K. Wang,
  • Y. Wang,
  • J. Watson,
  • B. Wojtsekhowski,
  • H. Witała,
  • Z. Ye,
  • X. Zhan,
  • Y. Zhang,
  • X. Zheng,
  • B. Zhao,
  • L. Zhu

Journal volume & issue
Vol. 788
pp. 117 – 121

Abstract

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We report on a precise measurement of double-polarization asymmetries in electron-induced breakup of He3 proceeding to pd and ppn final states, performed in quasi-elastic kinematics at Q2=0.25(GeV/c)2 for missing momenta up to 250MeV/c. These observables represent highly sensitive tools to investigate the electromagnetic and spin structure of He3 and the relative importance of two- and three-body effects involved in the breakup reaction dynamics. The measured asymmetries cannot be satisfactorily reproduced by state-of-the-art calculations of He3 unless their three-body segment is adjusted, indicating that the spin-dependent part of the nuclear interaction governing the three-body breakup process is much smaller than previously thought. Keywords: Double-polarization asymmetry, Helium-3 nucleus, Proton knock-out