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EG12 (E12-06-109)

EG12 (E12-06-109). Contact: S. Kuhn, Old Dominion University. Update for PAC36: Setting Scientific Priorities and Beam Allocation for approved 12 GeV experiments in the category “The longitudinal structure of the hadrons”. E12-06-109 – Scientific Case. BBS. BBS + L q. LSS.

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EG12 (E12-06-109)

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  1. EG12 (E12-06-109) Contact: S. Kuhn, Old Dominion University Update for PAC36: Setting Scientific Priorities and Beam Allocation for approved 12 GeV experiments in the category “The longitudinal structure of the hadrons”

  2. E12-06-109 – Scientific Case BBS BBS + Lq LSS • Pin down helicity structure of nucleon in valence region • Need to understand quark polarization u/u, d/d as x->1 • Unique test of pQCD predictions • Understand breaking of SU(6) symmetry • Semi-inclusive data *) => flavor separation, kT-dependence • Can only be done at JLab with 12 GeV • Comprehensive program requires p, d and 3He targets • Other programs (RHIC, COMPASS) focus on lowerx/higher Q2 • Anchor NLO DGLAP analyses at low Q2 • Require both semi-inclusive and inclusive data • Worldwide effort to extract q(x) for all quark flavors, and G(x) • Complementary to COMPASS (high-Q2) and RHIC (lower x) • Map moments to extract Higher Twist, test Duality • Extract OPE matrix elements like f2 • Need to expand existing measurements (EG1, EG1-DVCS, Hall A, Hall C) to higher Q2 and lower x to reduce systematic error of twist expansion • Need high-x data to compare to existing measurements in resonance region for duality studies *) K identification possible with RICH conditionally approved by PAC34

  3. SIDIS A1 - 1 of 5-10 bins p d Inclusive A1 h+ h- Stat ~ syst errors at high x Greater x-coverage for 1 Better determination of Higher Twist vs. x Improved coverage to evaluate moments Improved PDFs from NLO analyses E12-06-109 – Anticipated Data

  4. DIS coverage E12-06-109 – Request: • Ebeam = 11 GeV, Pb=85% • L  2 x 1035 /cm2/s • 25 days on p, 45 days on d, 10 days on auxiliary targets Assumptions: • CLAS12 acceptance • 3cm  x 3.3cm long DNP targets (1K, 5T) Pt=80% p(NH3), 40% d(ND3) • (consistent with EG1-DVCS) The Polarized Target – Recent Progress: • Funding provided through NSF MRI-R2 grant to ODU (lead), CNU and UVa (4/10 - 3/14) • Refrigerator design led by UVa/JLab • Integration with CLAS12 SVT • To be completed by end 2010 • Development of NMR started at ODU (with help from UVa and JLab); some equipment purchased • Development of µwave system started at CNU • some purchases require final magnetic field strength is known

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