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Spin structure functions - some topics for a future EIC

Spin structure functions - some topics for a future EIC. Sebastian Kuhn ODU. Things to measure:. g 1p,d,n : Evolution, low x extrapolation => Better determination of  G, Bjorken and Burkhardt-Cottingham sum rules,… SIDIS:  s,  u -  d, …; k T dependence

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Spin structure functions - some topics for a future EIC

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  1. Spin structure functions - some topics for a future EIC Sebastian Kuhn ODU

  2. Things to measure: • g1p,d,n: Evolution, low x extrapolation => Better determination of G, Bjorken and Burkhardt-Cottingham sum rules,… • SIDIS: s, u - d, …; kT dependence • Spin EMC effect with spectator tagging • Target fragmentation (e.g., self-analyzing  decay)

  3. Existing Data for p and d Close and Melnitchouk, PRC 68, 035210 (2003) Isgur, PRD 59, 034013 (2003) W > 2; Q2 > 1 } Proton Deuteron

  4. Predicted Data from CLAS12 Proton Deuteron W > 2; Q2 > 1

  5. Existing and proposed data for the neutron

  6. Present knowledge of s and G (ca 2008) Improvements in Du, Dd, DG, Ds expected before EIC Note: Decreased uncertainties below x = 0.05 misleading (artifact of over-constrained fit)

  7. EIC Kinematic Coverage (DIS) Jlab at 12 GeV

  8. DIS - low x Assume 10 GeV e- on 30 GeV d, Luminosity 1033/s/cm2, 100 days

  9. Status of first moments

  10. Flavor Decomposition from SIDIS EIC (copied from a talk by Pawel Nadel-Turonski)

  11. Concluding Thoughts • Even at modest energy and luminosity, it looks like we can make significant progress on spin structure • Obviously, I need to do some real work before making any firmer conclusions • Obvious upgrade path towards lower x as cm energy increases • We should stop thinking about DIS, SIDIS, PVDIS,… as different topics - instead, use unified EW theory as a comprehensive probe of inclusive nucleon structure, getting information from all structure functions F1 - F3, g1 - g5 (, -Z, W)

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