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Title: Polarized light ions and spectator nucleon tagging at EIC

The neutron's deep-inelastic structure functions provide essential information for the flavor separation of the nucleon parton densities, the nucleon spin decomposition, and precision studies of QCD phenomena in the flavor-singlet and nonsinglet sectors. Traditional inclusive measurements on nuclear targets are limited by dilution from scattering on protons, Fermi motion and binding effects, final-state interactions, and nuclear shadowing at x ll 0.1. An Electron-Ion Collider (EIC) would enable next-generation measurements of neutron structure with polarized deuteron beams and detection of forward-moving spectator protons over a wide range of recoil momenta (0 < p(R) < several 100MeV in the nucleus rest frame). The free neutron structure functions could be obtained by extrapolating the measured recoil momentum distributions to the on-shell point. The method eliminates nuclear modifications and can be applied to polarized scattering, as well as to semi-inclusive and exclusive final states. We review the prospects for neutron structure measurements with spectator tagging at EIC, the status of R&D efforts, and the accelerator and detector requirements.
 [1] ;  [2] ;  [3] ;  [2] ;  [3] ;  [4] ;  [5] ;  [2]
  1. Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia
  2. JLAB
  3. Old Dominion University, Norfolk, VA 23529, USA
  4. Florida International University, Miami, FL 33199, USA
  5. Pennsylvania State University, University Park, PA 16802, USA
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-THY-14-1913; arXiv:1407.3236; DOE/OR/23177-3126
DOE Contract Number:
Resource Type:
Resource Relation:
Journal Name: Proceedings of Science; Journal Volume: DIS; Journal Issue: 2014; Conference: DIS 2014, 28 Apr - 2 May 2014. Warsaw, Poland
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States