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Proton Spin in the EIC Era EIC Panel Discussion

Proton Spin in the EIC Era EIC Panel Discussion. Feng Yuan* Lawrence Berkeley National Laboratory. Electron Ion Collider Users Meeting Stony Brook University, June 24-27 2014. *discussions with Ernst Sichtermann.

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Proton Spin in the EIC Era EIC Panel Discussion

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  1. Proton Spin in the EIC EraEIC Panel Discussion Feng Yuan* Lawrence Berkeley National Laboratory Electron Ion Collider Users Meeting Stony Brook University, June 24-27 2014 *discussions with Ernst Sichtermann

  2. Precision constraints on the partonhelicity contributions in the nucleon spin: NNPDF, arXiv:1406.5539 (June 20th): = With positive contributions from RHIC measured range: = based on additional (2009) data. See also DSSV, arXiv:1404.4293. gluon spin quark spin × 2

  3. Parton Orbital Motion from nucleon tomography: -0.5 0.5 0.0 • Spin measurements at EIC will extend not only the range in x and Q2, but will also enable 2+1D imaging of quarks and gluons. 0.5 ky 0.0 -0.5 kx

  4. Fundamental Understandingofthe Nucleon Spinand the Role of Spin in QCD EIC Measurements Lattice QCD Detmold’s talk recent developments: Ji, 2013,Lin, et al, 2014 Ma, Qiu, 2014, Ji-Sun-Xiong-Yuan, 2014 (TMDs) Theory/Phenomenology

  5. Back-up

  6. Wide Q2 Range Crucial for TMDs Leading power TMD Non-singular term in CSS (power corrections)

  7. TMD factorization in quasi-pdfs • For example, for Drell-Yan lepton pair production Soft factor Lattice calculation Quasi-pdfs

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